Austrian Space Weather Office
@aswogeosphere.bsky.social
Inventing the next generation of space weather prediction at the
GeoSphere Austria. | ☀️ @erc.europa.eu HELIO4CAST | funded by @fwf-at.bsky.social | https://helioforecast.space | https://geosphere.at/en/topics/disaster-protection/space-weather
GeoSphere Austria. | ☀️ @erc.europa.eu HELIO4CAST | funded by @fwf-at.bsky.social | https://helioforecast.space | https://geosphere.at/en/topics/disaster-protection/space-weather
On Saturday Nov 15 this #solarstorm arrived at STEREO-A, as seen in the magnetic field in the 2nd panel here, 49° west of Earth. This one caused only a minor signature at Earth. At STEREO-A the magnetic field was even stronger than last weeks storm near 🌍, with 76 nT total field and -57 nT Bz!
November 17, 2025 at 8:37 AM
On Saturday Nov 15 this #solarstorm arrived at STEREO-A, as seen in the magnetic field in the 2nd panel here, 49° west of Earth. This one caused only a minor signature at Earth. At STEREO-A the magnetic field was even stronger than last weeks storm near 🌍, with 76 nT total field and -57 nT Bz!
An ELEvo run is already available, this storm with the X4 flare had an initial speed of about 1500 km/s and direction of 62° west.
November 14, 2025 at 3:35 PM
An ELEvo run is already available, this storm with the X4 flare had an initial speed of about 1500 km/s and direction of 62° west.
The Nov 14 2025 storm will travel towards the STEREO-A spacecraft by the way, which is currently 50° west of Earth, and possibly Solar Orbiter will get a glimpse of it at 17° west, and Earth maybe too (but much less than earlier this week).
November 14, 2025 at 3:27 PM
The Nov 14 2025 storm will travel towards the STEREO-A spacecraft by the way, which is currently 50° west of Earth, and possibly Solar Orbiter will get a glimpse of it at 17° west, and Earth maybe too (but much less than earlier this week).
With this "outside" perspective combined with images taken from L1 the initial conditions like shape, direciton and speed can be determined more accurately with #Vigil data.
November 14, 2025 at 3:27 PM
With this "outside" perspective combined with images taken from L1 the initial conditions like shape, direciton and speed can be determined more accurately with #Vigil data.
Notice the direction of this storm? The source is at about 60° west of Earth. This means that this is how the @esa.int #Vigil spacecraft (2031-) would image an Earth directed #solarstorm from the L5 point, as L5 is 60° behind the Earth's orbit.
November 14, 2025 at 3:27 PM
Notice the direction of this storm? The source is at about 60° west of Earth. This means that this is how the @esa.int #Vigil spacecraft (2031-) would image an Earth directed #solarstorm from the L5 point, as L5 is 60° behind the Earth's orbit.
Then the coronagraph images by SOHO/LASCO -
November 14, 2025 at 3:27 PM
Then the coronagraph images by SOHO/LASCO -
At the moment Dst is -176 nT, so a major geomagnetic storm is still ongoing. With no more major solar eruptions incoming we expect that this storm will decline now over the coming days.
November 13, 2025 at 8:00 AM
At the moment Dst is -176 nT, so a major geomagnetic storm is still ongoing. With no more major solar eruptions incoming we expect that this storm will decline now over the coming days.
Note also that the ECMWF maps do show some more high cloud cover in central Europe.
November 12, 2025 at 8:34 PM
Note also that the ECMWF maps do show some more high cloud cover in central Europe.
It definitely depends though on how much the Bz will stay at < 0, lets see if we get to see a magnetic flux rope at L1. But the speed is fast (if trustable). This storm was directed a bit off the Sun-Earth line towards about 20° north and 20° west of Earth, quite in the direction of #SolarOrbiter.
November 12, 2025 at 8:22 PM
It definitely depends though on how much the Bz will stay at < 0, lets see if we get to see a magnetic flux rope at L1. But the speed is fast (if trustable). This storm was directed a bit off the Sun-Earth line towards about 20° north and 20° west of Earth, quite in the direction of #SolarOrbiter.
We think that due to the interaction the storms don't expand much so we left out the usually included expansion method for the prediction for the L1 arrival of the storm magnetic field. Thus the storm from early Tuesday should arrive soon as seen in the 2nd panel of the magnetic field in situ plots.
November 12, 2025 at 1:32 PM
We think that due to the interaction the storms don't expand much so we left out the usually included expansion method for the prediction for the L1 arrival of the storm magnetic field. Thus the storm from early Tuesday should arrive soon as seen in the 2nd panel of the magnetic field in situ plots.
In hindsight the @esa.int BepiColombo magnetic field instrument could give us interesting data of this event, and Solar Orbiter is here closer to the direction of the solar storm than Earth.
November 11, 2025 at 4:03 PM
In hindsight the @esa.int BepiColombo magnetic field instrument could give us interesting data of this event, and Solar Orbiter is here closer to the direction of the solar storm than Earth.