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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: Earth
Event Time: 2026-03-20T20:17Z ( ACE: MAG )
All Detecting Spacecrafts:
ACE: MAG
ACE: SWEPAM
DSCOVR: PLASMAG
Activity ID: 2026-03-20T20:17:00-IPS-001 (version 4)
Quality of ICME Signature: 2 (clear signatures)
Note: Sharp increase in B_total from already elevated ~20 nT (following the IPS at L1 as detected by ACE and DSCOVR at 2026-03-20T01:31Z) to >36 nT. This arrival signature also includes sudden increase in solar wind speed from 450 to 550 km/s, in ion temperature from 20K to over 800K and in ion density from the already elevated 19 particles/cc to over 55 particles/cc. The shock seems to be followed by a flux rope starting at ~2026-03-21T02:18Z, with smoother rotation of magnetic field components and a drop in ion temperature and density. 
Version 1 submitted on 2026-03-20T21:13Z by Carina Alden
Version 2 submitted on 2026-03-20T21:26Z by Carina Alden
Version 3 submitted on 2026-03-22T22:00Z by Anna Chulaki
Version 4 submitted on 2026-03-22T22:02Z by Anna Chulaki
A Notification with ID 20260320-AL-004 was sent on 2026-03-20T21:25Z

All directly linked activities:
2026-03-18T09:23:00-CME-001
2026-03-20T18:00:00-GST-001
NOAA Kp: 5.67 (2026-03-20T21:00Z)
NOAA Kp: 6.67 (2026-03-21T00:00Z)
NOAA Kp: 7.0 (2026-03-21T03:00Z)
NOAA Kp: 6.0 (2026-03-21T06:00Z)
2026-03-20T21:13:00-MPC-001


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