NASA StreaM

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Magnetopause Crossing ## ## Message Issue Date: 2026-03-20T21:39:41Z ## Message ID: 20260320-AL-005 ## ## Disclaimer: NOAA's Space Weather Prediction Center is the United States Government official source for space weather forecasts. This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly. ## Summary: Strong compression of the magnetosphere detected. Simulations carried out at NASA Community Coordinated Modeling Center indicate that the magnetopause separating magnetospheric and solar wind plasma is close to the geosynchronous orbit starting at 2026-03-20T21:13Z. The activity is associated with the Interplanetary Shock with ID 2026-03-20T20:17:00-IPS-001 (see notification 20260320-AL-004) and with the arrival of the CME with ID 2026-03-18T09:23:00-CME-001 (see notifications 20260318-AL-002, 20260318-AL-003). NASA spacecraft at the geosynchronous orbits may be exposed to solar wind plasma and magnetic field conditions. Activity ID: 2026-03-20T21:13:00-MPC-001. ## Notes This Interplanetary Shock (2026-03-20T20:17:00-IPS-001) was associated with Geomagnetic Storm with ID 2026-03-20T18:00:00-GST-001 (see notification 20260320-AL-003). Additional compression of the magnetosphere may have been associated with the preceding Interplanetary Shock with ID 2026-03-20T01:31:00-IPS-001 (see notification 20260320-AL-001 ).