あらせ
An international team of physicists from Southampton examined data from ground-based cameras, imaging satellites, and radio measurements from spacecraft including NASA's Polar mission and Japan's Arase satellite.
The team used data from the Arase satellite to observe the compression and recovery of the plasmasphere during a geomagnetic storm.
Researchers used the Arase satellite to observe the plasmasphere shrink to a fraction of its usual size during the storm.