New research using data from NASA’s Van Allen Probes mission helps resolve decades of scientific uncertainty over the origin of ultra-relativistic electrons in the Earth’s near space environment, and is likely to influence our understanding of planetary magnetospheres throughout the universe. See: Scientists solve a decades-old mystery of Earth's Van Allen radiation belts
Wednesday, December 18, 2013
Thursday, July 04, 2013
Published on May 13, 2013
On May 12-13 the sun erupted with an X1.7-class and an X2.8-class flare as well as two coronal mass ejections, or CMEs, off the upper left side of the sun. Solar material also danced and blew off the sun in what's called a prominence eruption, both in that spot and on the lower right side of the sun. This movie compiles imagery of this activity from NASA's Solar Dynamics Observatory and from the ESA/NASA Solar Heliospheric Observatory.
Music: "Long Range Cruise" by Lars Leonhard, courtesy of the artist and BineMusic. www.lars-leonhard.de
This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/vis/a010000/...
Tuesday, June 25, 2013
NASA is getting ready to launch a new mission, a mission to observe a largely unexplored region of the solar atmosphere that powers its dynamic million-degree outer atmosphere and drives the solar wind. In late June 2013, the Interface Region Imaging Spectrograph, or IRIS, will launch from Vandenberg Air Force Base, Calif. IRIS will advance our understanding of the interface region, a region in the lower atmosphere of the sun where most of the sun's ultraviolet emissions are generated. Such emissions impact the near-Earth space environment and Earth's climate. See:IRIS: Studying the Energy Flow that Powers the Solar Atmosphere
Monday, May 13, 2013
|SOHO EIT 304 Latest Image|
- On-line Journals (links open to a new window)
- Astronomy & Astronomische Nachrichten (Astronomical Notes)
- Astronomy and Astrophysics
- Astronomy and Astrophysics Review
- Astrophysical Journal
- Astrophysical Journal Letters
- Geophysical Research Letters
- Journal of Geophysical Research
- Living Reviews in Solar Physics
- Monthly Notices of the Royal Astronomical Society
- New Astronomy
- Solar Physics
- The American Institute of Physics Press
Thursday, May 02, 2013
|The Heliophysics System Observatory (HSO) showing current operating missions, missions in development, and missions under study. Credit: NASA|
NASA operates a system observatory of Heliophysics missions, utilizing the entire fleet of solar, heliospheric, and geospace spacecraft to discover the processes at work throughout the space environment. In addition to its science program, NASA’s Heliophysics Division routinely partners with other agencies to fulfill the space weather research or operational objectives of the nation. See: What are our current capabilities to predict space weather?
Circular Coronal Mass Ejection A coronal mass ejection (CME) erupted from just around the edge of the sun on May 1, 2013, in a gigantic rolling wave. CMEs can shoot over a billion tons of particles into space at over a million miles per hour. This CME occurred on the sun’s limb and is not headed toward Earth. The video, taken in extreme ultraviolet light by NASA’s Solar Dynamics Observatory (SDO), covers about two and a half hours. Credit: NASA/SDO
|Current Space Weather Conditions|
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.
Updated 2013 May 01 2200 UTCJoint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 121 Issued at 2200Z on 01 May 2013
Wednesday, February 20, 2013
On July 19, 2012, an eruption occurred on the sun that produced a moderately powerful solar flare and a dazzling magnetic display known as coronal rain. Hot plasma in the corona cooled and condensed along strong magnetic fields in the region. Magnetic fields, are invisible, but the charged plasma is forced to move along the lines, showing up brightly in the extreme ultraviolet wavelength of 304 Angstroms, and outlining the fields as it slowly falls back to the solar surface See: Raining Loops on the Sun
Saturday, February 09, 2013
A massive winter storm is coming together as two low pressure systems are merging over the U.S. East Coast. A satellite image from NOAA's GOES-13 satellite on Feb. 8 shows a western frontal system approaching the coastal low pressure area.
The satellite image, captured at 9:01 a.m. EST, shows clouds associated with the western frontal system stretching from Canada through the Ohio and Tennessee valleys, into the Gulf of Mexico. The comma-shaped low pressure system located over the Atlantic, east of Virginia, is forecast to merge with the front and create a powerful nor'easter. The National Weather Service expects the merged storm to move northeast and drop between two to three feet of snow in parts of New England. See: Nasa-Image of the Day
Monday, October 01, 2012
A single period of geomagnetic storming reaching the G3 (Strong) level was observed overnight. Since that time, geomagnetic activity has been on the decline as the CME influence has continued to weaken. No further significant activity is expected at this time but stay tuned for updates.
Monday, September 03, 2012
2012-09-03 15:14 UTC G2 (Moderate) Geomagnetic Storm in Progress
G2 (Moderate) geomagnetic storming is ongoing now as a result of the coronal mass ejection (CME) arrival associated with the August 31st filament eruption. Continued geomagnetic storming is expected in the near term as the CME continues to affect Earth. Solar radiation storm levels continue to hover near the S1 (Minor) event threshold but should continue their slow decline toward background levels. Stay tuned for updates. See:Space Weather Prediction Center
Sunday, August 26, 2012
The launch of an Atlas V carrying NASA's Radiation Belt Storm Probes (RBSP) payload was scrubbed today due to weather conditions associated with lightning, as well as cumulus and anvil clouds. With the unfavorable weather forecast as a result of Tropical Storm Isaac, the leadership team has decided to roll the Atlas V vehicle back to the Vertical Integration Facility to ensure the launch vehicle and twin RBSP spacecraft are secured and protected from inclement weather. Pending approval from the range, the launch is rescheduled to Thursday, Aug. 30 at 4:05 a.m. Eastern Daylight Time. See: RBSP Launch Targeted for No Earlier Than Aug. 30
RBSP is being designed to help us understand the Sun’s influence on Earth and Near-Earth space by studying the Earth’s radiation belts on various scales of space and time.
The instruments on NASA’s Living With a Star Program’s (LWS) Radiation Belt Storm Probes (RBSP) mission will provide the measurements needed to characterize and quantify the plasma processes that produce very energetic ions and relativistic electrons. The RBSP mission is part of the broader LWS program whose missions were conceived to explore fundamental processes that operate throughout the solar system and in particular those that generate hazardous space weather effects in the vicinity of Earth and phenomena that could impact solar system exploration. RBSP instruments will measure the properties of charged particles that comprise the Earth’s radiation belts, the plasma waves that interact with them, the large-scale electric fields that transport them, and the particle-guiding magnetic field.
The two RBSP spacecraft will have nearly identical eccentric orbits. The orbits cover the entire radiation belt region and the two spacecraft lap each other several times over the course of the mission. The RBSP in situ measurements discriminate between spatial and temporal effects, and compare the effects of various proposed mechanisms for charged particle acceleration and loss. See: RBSP
|Credit: NASA/Johns Hopkins University Applied Physics Laboratory|
Engineers at the Johns Hopkins University Applied Physics Laboratory in Laurel, Md., prepare to place Radiation Belt Storm Probes spacecraft "B" in a thermal-vacuum chamber, where they can make sure the propulsion system will stand up to the range of hot, cold and airless conditions RBSP will face in outer space. This round of testing took place in late October-early November 2010.
Tuesday, July 10, 2012
|Volcano and Aurora in Iceland |
Image Credit & Copyright: Sigurdur H. Stefnisson
Explanation: Sometimes both heaven and Earth erupt. In Iceland in 1991, the volcano Hekla erupted at the same time that auroras were visible overhead. Hekla, one of the most famous volcanoes in the world, has erupted at least 20 times over the past millennium, sometimes causing great destruction. The last eruption occurred only twelve years ago but caused only minor damage. The green auroral band occurred fortuitously about 100 kilometers above the erupting lava. Is Earth the Solar System's only planet with both auroras and volcanos? See: Astronomy Picture of the Day
It is of great consequence that while we understand the sun has it's place in the sky, do we understand the interactions that are taking place as the Earth radiates as well? If thunderstorms can releases information for us, then it puts a whole new spin on what is happening within Earth's space.
Monday, July 09, 2012
|This image taken by SDO's AIA instrument at 171 Angstrom shows the current conditions of the quiet corona and upper transition region of the Sun.|
|Active Region 1515 released an M6.9 class flare beginning at 12:23 PM EDT and peaking at 12:32 on July 7, 2012. This region has been the source of much solar activity since July 2.|
See: Today's Space Weather
|This plot shows 3-days of 5-minute solar x-ray flux values measured on the SWPC primary GOES satellite. One low value may appear prior to eclipse periods. Click on the plot to open an updating secondary window. 6-hour 1-min Solar X-ray Flux plot.|
Tuesday, January 24, 2012
A large solar flare yesterday triggered a coronal mass ejection travelling at 1400 km/s that will reach Earth today. An energetic eruption of this level can disrupt satellites, so operation teams at ESA and other organisations are closely monitoring the storm.
A coronal mass ejection (CME) is a huge cloud of magnetised plasma from the Sun's atmosphere – the corona – thrown into interplanetary space. They often occur in association with a solar flare. This ejection was detected by the ESA/NASA SOHO and NASA Stereo spaceborne solar observatories. See: Solar storm heading toward Earth
|Center time of most recent polar pass measurement: 2012 Jan 25 0137 UTn = 2.16|
Friday, November 11, 2011
Monday, October 03, 2011
Wiki Growth Over Time
This is a project conducted by ChrisDavis and IgorNikolic to visualize the growth of wiki.tudelft.nl since its beginning in late 2004. Since then, it has grown to over 10,000 pages, and is now part of the officially supported ICT infrastructure of Delft University of Technology. This wiki is meant to be a free-form repository of information where people contribute content that helps with their research. This often takes the form of pages documenting articles that people have read, "how to" pages, and records of conferences and meetings.Project Motivation
This is a visualization of the evolution of wiki.tudelft.nl from the very beginning, 5 years ago. Each node is a page, links are connections between pages. Graph is laid out using a force-directed algorithm, where the edges (links between pages) pull the nodes (pages) together, and the nodes (pages) repel each other. This means that the more tightly connected nodes will be closer together than weakly connected ones, which are pushed to the outside. The entire thing is created using Prefuse (http://prefuse.org/), wiki is using the TWiki engine (http://twiki.org). The soundtrack is from DJ Cary's Eastern Grooves compilation from Magnatune.com. More info about this can be found at http://wiki.tudelft.nl/bin/view/Main/WikiGrowthOverTime
Licensed under Creative Commons http://creativecommons.org/licenses/by-nc-sa/3.0/
Partial map of the Internet based on the January 15, 2005 data found on opte.org. Each line is drawn between two nodes, representing two IP addresses. The length of the lines are indicative of the delay between those two nodes. This graph represents less than 30% of the Class C networks reachable by the data collection program in early 2005. Lines are color-coded according to their corresponding RFC 1918 allocation as follows:See:
- Dark blue: net, ca, us
- Green: com, org
- Red: mil, gov, edu
- Yellow: jp, cn, tw, au, de
- Magenta: uk, it, pl, fr
- Gold: br, kr, nl
- White: unknown
Tuesday, March 29, 2011
The Living With a Star (LWS) program emphasizes the science necessary to understand those aspects of the Sun and the Earth's space environment that affect life and society. The ultimate goal is to provide a predictive understanding of the system, and specifically of the space weather conditions at Earth and in the interplanetary medium.
LWS missions have been formulated to answer specific science questions needed to understand the linkages among the interconnected systems that impact us. LWS products impact technology associated with space systems, communications and navigation, and ground systems such as power grids.The coordinated LWS program includes strategic missions, targeted research and technology development, a space environment test bed flight opportunity, and partnerships with other agencies and nations.Living With A Star
Who would have ever thought to consider our own Sun as a member of the Cosmos, as a Star?
|Solar Probe Fact Sheet(click on Image)|
Solar Probe+ will be an extraordinary and historic mission, exploring what is arguably the last region of the solar system to be visited by a spacecraft, the Sun’s outer atmosphere or corona as it extends out into space. Approaching as close as 9.5 solar radii* (8.5 solar radii above the Sun’s surface), Solar Probe+ will repeatedly sample the near-Sun environment, revolutionizing our knowledge and understanding of coronal heating and of the origin and evolution of the solar wind and answering critical questions in heliophysics that have been ranked as top priorities for decades. Moreover, by making direct, in-situ measurements of the region where some of the most hazardous solar energetic particles are energized, Solar Probe+ will make a fundamental contribution to our ability to characterize and forecast the radiation environment in which future space explorers will work and live. See:Solar Probe Plus
As with anything if we want peer deeper in the construction of the world around us it is necessary sometimes to put on different glasses for different perspectives. So it is about how we can look at the universe around us.
| ACE |
Advanced Composition Explorer (ACE) observes particles of solar, interplanetary, interstellar, and galactic origins, spanning the energy range from solar wind ions to galactic cosmic ray nuclei. This mission is part of SMD's Explorers Program. This mission is part of SMD's ...
| AIM |
Aeronomy of Ice in the Mesosphere (AIM) is a mission to determine the causes of the highest altitude clouds in the Earth's atmosphere. The number of clouds in the middle atmosphere (mesosphere) over the Earth's poles has been increasing over ...
| BARREL |
The Balloon Array for Radiation-belt Relativistic Electron Losses mission is a balloon-based Mission of Opportunity to augment the measurements of NASA's RBSP spacecraft. This mission is part of SMD's LWS program.
| CINDI/CNOFS |
The Coupled Ion-Neutral Dynamics Investigations (CINDI) is a mission to understand the dynamics of the Earth's ionosphere. CINDI will provide two instruments for the Communication/Navigation Outage Forecast System (C/NOFS) satellite, a project of the United States Air Force. This mission ...
| Cluster-II |
Cluster is a European Space Agency program with major NASA involvement. The 4 Cluster spacecraft are providing a detailed three-dimensional map of the magnetosphere, with surprising results. This mission is part of SMD's Heliophysics Research program.
| Equator-S |
Equator-S was a German Space Agency project, with contributions from ESA and NASA, related to the International Solar-Terrestrial Physics program. The mission provided high-resolution plasma, magnetic, and electric field measurements in several regions not adequately covered by any of the ...
| FAST |
Fast Auroral Snapshot Explorer (FAST) studies the detailed plasma physics of the Earth's auroral regions. Ground support campaigns coordinate satellite measurements with ground observations of the Aurora Borealis, commonly referred to as the Northern Lights. The science instruments on board ...
| Geotail |
The GEOTAIL mission is a collaborative project undertaken by the Japanese Institute of Space and Astronautical Science (ISAS) and NASA. Its primary objective is to study the tail of the Earth's magnetosphere. The information gathered is allowing scientists to model ...
| Hinode (Solar-B) |
Hinode (formerly known as Solar-B) is a Japanese ISAS mission proposed as a follow-on to the highly successful Japan/US/UK Yohkoh (Solar-A) collaboration. The mission consists of a coordinated set of optical, EUV and X-ray instruments that are studying the interaction ...
| IBEX |
IBEX will be the first mission designed to detect the edge of the Solar System. As the solar wind from the sun flows out beyond Pluto, it collides with the material between the stars, forming a shock front. This mission ...
| IMAGE |
IMAGE studied the global response of the magnetosphere to changes in the solar wind. Major changes occur to the configuration of the magnetosphere as a result of changes in and on the Sun, which in turn change the solar wind.
| IMP-8 |
IMP 8 has deepened understanding of the space environment near Earth in many ways. Observations from IMP 8 provided insight into plasma physics, the Earth's magnetic field, the structure of the solar wind and the nature of cosmic rays.
| IRIS |
The primary goal of the Interface Region Imaging Spectrograph (IRIS) explorer is to understand how the solar atmosphere is energized. The IRIS investigation combines advanced numerical modeling with a high resolution UV imaging spectrograph.
| ISEE |
The ISEE (International Sun-Earth Explorer) program was an international cooperative program between NASA and ESA to study the interaction of the solar wind with the Earth's magnetosphere.
| MMS |
The Magnetospheric Multiscale mission will determine the small-scale basic plasma processes which transport, accelerate and energize plasmas in thin boundary and current layers – and which control the structure and dynamics of the Earth's magnetosphere. MMS will for the first ...
| Polar |
Polar is the second of two NASA spacecraft in the Global Geospace Science (GGS) initiative and part of the ISTP Project. GGS is designed to improve greatly the understanding of the flow of energy, mass and momentum in the solar-terrestrial ...
| RBSP |
The RBSP mission will provide scientific understanding, ideally to the point of predictability, of how populations of relativistic electrons and ions in space form and change in response to variable inputs of energy from the Sun.
| RHESSI |
Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) studies solar flares in X-rays and gamma-rays. It explores the basic physics of particle acceleration and explosive energy release in these energetic events in the Sun's atmosphere. This is accomplished by imaging ...
| SAMPEX |
The Solar Anomalous and Magnetospheric Particle Explorer is investigating the composition of local interstellar matter and solar material and the transport of magnetospheric charged particles into the Earth's atmosphere.
| SNOE |
SNOE ("snowy") was a small satellite investigating the effects of energy from the Sun and from the magnetosphere on the density of nitric oxide in the Earth's upper atmosphere.
| SOHO |
Solar and Heliospheric Observatory (SOHO) is a solar observatory studying the structure, chemical composition, and dynamics of the solar interior. SOHO a joint venture of the European Space Agency and NASA. This mission is part of SMD's Heliophysics Research program.
| Solar Dynamics Observatory (SDO) |
The Solar Dynamics Observatory (SDO) is the first mission and crown jewel in a fleet of NASA missions to study our sun. The mission is the cornerstone of a NASA science program called Living With a Star (LWS). The goal ...
| Solar Orbiter |
Solar Orbiter is a European Space Agency (ESA) mission to study the Sun from a distance closer than any spacecraft previously has, and will provide images and measurements in unprecedented resolution and detail. This mission is part of SMD's LWS ...
| Solar Probe Plus |
Solar Probe Plus will be a historic mission, flying into one of the last unexplored regions of the solar system, the Sun’s atmosphere or corona, for the first time. This mission is part of SMD's LWS Program.
| Space Environment Testbeds |
The Space Environment Testbeds (SET) Project performs flight and ground investigations to understand how the Sun/Earth interactions affect humanity.
| Spartan 201 |
Spartan is a small, Shuttle-launched and retrieved satellite. Spartan 201, whose mission is to study the Sun, has a science payload consisting of two telescopes: the Ultraviolet Coronal Spectrometer (UVCS) and the White Light Coronagraph (WLC). Spartan 201 was launched ...
| ST5 |
Space Technology 5 (ST5) flight tested its miniaturized satellites and innovative technologies in the harsh environment of Earth's magnetosphere.
| STEREO |
The goal of STEREO is to understand the origin the Sun's coronal mass ejections (CMEs) and their consequences for Earth. The mission consists of two spacecraft, one leading and the other lagging Earth in its orbit. The spacecraft carries instrumentation ...
| THEMIS |
Time History of Events and Macroscale Interactions during Substorms (THEMIS) is a study of the onset of magnetic storms within the tail of the Earth's magnetosphere. THEMIS will fly five microsatellite probes through different regions of the magnetosphere and observe ...
| TIMED |
Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) explores the energy transfer into and out of the Mesosphere and Lower Thermosphere/Ionosphere (MLTI) region of the Earth's atmosphere. This mission is part of SMD's Solar Terrestrial Probes Program.
| TRACE |
Transition Region and Coronal Explorer (TRACE) observes the effects of the emergence of magnetic flux from deep inside the Sun to the outer corona with high spatial and temporal resolution. This mission is part of SMD's Heliophysics Explorers program. This ...
| TWINS A & B |
TWINS will provide stereo imaging of the Earth's magnetosphere, the region surrounding the planet controlled by its magnetic field and containing the Van Allen radiation belts and other energetic charged particles. This mission is part of SMD's Explorers Program. This ...
| Ulysses |
The Ulysses Mission is the first spacecraft to explore interplanetary space at high solar latitudes, orbiting the Sun nearly perpendicular to the plane in which the planets orbit. This mission is part of SMD's Heliophysics Research program.
| Voyager |
The twin Voyager 1 and 2 spacecraft continue exploring where nothing from Earth has flown before. In the 25th year after their 1977 launches, they each are much farther away from Earth and the Sun than Pluto is and approaching ...
| Wind |
Wind studies the solar wind and its impact on the near-Earth environment. This mission is part of SMD's Heliophysics Research program.
| Yohkoh |
Yohkoh, an observatory for studying X-rays and gamma-rays from the Sun, is a project of the Institute for Space and Astronautical Sciences, Japan.
Monday, October 11, 2010
The Sun Now-
EIT (Extreme ultraviolet Imaging Telescope) images the solar atmosphere at several wavelengths, and therefore, shows solar material at different temperatures. In the images taken at 304 Angstrom the bright material is at 60,000 to 80,000 degrees Kelvin. In those taken at 171 Angstrom, at 1 million degrees. 195 Angstrom images correspond to about 1.5 million Kelvin, 284 Angstrom to 2 million degrees. The hotter the temperature, the higher you look in the solar atmosphere. About the Very Latest SOHO Images
The Satellite Environment Plot combines satellite and ground-based data to provide an overview of the current geosynchronous satellite environment. Click on a data panel to open an updating secondary window. An updating Satellite Environment Plot window is also available.
Although these data are of interest to the satellite community, they do not include all parameters and energy ranges known to be associated with satellite anomalies. See related information from the NOAA POES satellite -- Auroral Activity Estimates, Relative Intensities of Energetic Particles, and Solar Protons.
Saturday, August 07, 2010
3-day Solar-Geophysical Forecast issued Aug 07 22:00 UTCSolar Activity Forecast: Solar activity is expected to be very low to low with C-class flares likely from Region 1093 and 1095 (S18E19). A chance of M-class activity is possible from Region 1093.
Geophysical Activity Forecast: Geomagnetic field activity is expected to be mostly quiet with an isolated chance of unsettled levels during the next three days (08 - 10 August). See: Today's Space Weather
Solar flares are classified as A, B, C, M or X according to the peak flux (in watts per square meter, W/m2) of 100 to 800 picometer X-rays near Earth, as measured on the GOES−4 W/m2. Within a class there is a linear scale from 1 to 9, so an X2 flare is twice as powerful as an X1 flare, and is four times more powerful than an M5 flare. The more powerful M and X class flares are often associated with a variety of effects on the near-Earth space environment. Although the GOES classification is commonly used to indicate the size of a flare, it is only one measure. This extended logarithmic earthquakes show similar power-law***
Chisasibi, Quebec, Canada
Aug. 4, 2010
Chisasibi, Quebec, Canada
Aug. 4, 2010
The whole sky was green, purple, I had a hard time deciding where to aim my cameras! Here are 3 pictures taken from a long series to make an animation of the movement. Nikon D3s , 10 000 ASA, 10.5 mm f2.8 set at full frame to get wider than the Dx format ! the last one was taken with a Nikon D3 with a 28mm f1.4 at 3200 ASA See: Aurora Photo Gallery 2010
Monday, January 25, 2010
See also:Poincaré Hyperbolic Disk
Geometric models of hyperbolic geometry include the Klein-Beltrami model, which consists of an open disk in the Euclidean plane whose open chords correspond to hyperbolic lines. A two-dimensional model is the Poincaré hyperbolic disk.
Weisstein, Eric W. "Hyperbolic Geometry." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/HyperbolicGeometry.html
Helioseismology is the study of the propagation of wave oscillations, particularly acoustic pressure waves, in the Sun.
Measurements of the Sun's oscillations provide a window into the invisible interior of the Sun allowing scientists to infer the structure and composition as well as the rotation and dynamics of the solar interior.
(Extreme ultraviolet Imaging Telescope) images the solar atmosphere at several wavelengths, and therefore, shows solar material at different temperatures. In the images taken at 304 Angstroms the bright material is at 60,000 to 80,000 degrees Kelvin. In those taken at 171, at 1 million degrees. 195 Angstrom images correspond to about 1.5 million Kelvin. 284 Angstrom, to 2 million degrees. The hotter the temperature, the higher you look in the solar atmosphere.
The mysterious source of these oscillations was identified by way of theoretical arguments in 1970 and confirmed by observations in 1975. The oscillations we see on the surface are due to sound waves generated and trapped inside the sun. Sound waves are produced by pressure fluctuations in the turbulent convective motions of the sun's interior. As the waves move outward they reflect off of the sun's surface (the photosphere) where the density and pressure decrease rapidly..
***It's Effect on Earth
The plots on this page show the current extent and position of the auroral oval at each pole, extrapolated from measurements taken during the most recent polar pass of the NOAA POES satellite. "Center time" is the calculated time halfway through the satellite's pass over the pole.
Today's Space Weather
Any threat to communications is always seriously assessed. What we want to see on the other side of the Sun is whether any outburst is coming, that could seriously affect those same communications.
See Also:Backreaction: Reflections on the Sun