interplanetary shock tagged posts

This is an artist concept of accelerated electrons circulating in Earth’s Van Allen radiation belts. Credit: NASA’s Goddard Space Flight Center; Tom Bridgman, animator

Our planet is in the center of 2 immense, concentric doughnuts of powerful radiation: Van Allen radiation belts, which harbor swarms of charged particles that are trapped by Earth’s magnetic field. On March 17, 2015, an interplanetary shock – a shockwave created by the driving force of a coronal mass ejection, CME, from the sun – struck Earth’s magnetic field, the magnetosphere, triggering the greatest geomagnetic storm of the preceding decade. And NASA’s Van Allen Probes were there to watch the effects on the radiation belts.

One of the most common forms of space weather, a geomagnetic storm describes any event in which the...