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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: Earth
Event Time: 2026-03-20T01:31Z ( ACE: MAG )

All Detecting Spacecrafts:

ACE: MAG

ACE: SWEPAM

DSCOVR: PLASMAG

Activity ID: 2026-03-20T01:31:00-IPS-001 (version 5)
Quality of ICME Signature: 2 (clear signatures)
Note: Arrival signature primarily characterized by a series of sharp jumps in B_total starting at 2026-03-20T01:31Z and an associated increase in solar wind speed. The first jump in B_total is from ~5 nT to ~8 nT with B_total subsequently reaching ~18.5 nT by 2026-03-20T10:09Z. The solar wind speed increases from ~330 km/s to ~450 km/s. The shock signature is also accompanied by an increase in temperature and an increase in density. There is a likely flux rope signature seen starting ~2026-03-20T13:22Z, with smooth rotation of magnetic field components. That flux rope signature is interrupted by a sudden B_total jump indicating the start of the next, separate Interplanetary Shock at 2026-03-20T20:17Z. This arrival signature is likely the combined arrival of four CMEs simulated together expected to give Missions Near Earth a glancing blow at 2026-03-20T06:00Z (+- 7 hours), including CME 2026-03-17T05:08Z, CME 2026-03-17T06:38Z, CME 2026-03-17T08:23Z, and CME 2026-03-17T10:53Z.

Version 1 submitted on 2026-03-20T11:14Z by Elizabeth Juelfs
Version 2 submitted on 2026-03-22T21:53Z by Anna Chulaki
Version 3 submitted on 2026-03-22T22:03Z by Anna Chulaki
Version 4 submitted on 2026-03-24T16:46Z by Tony Iampietro
Version 5 submitted on 2026-03-24T22:13Z by Mary Aronne

A Notification with ID 20260320-AL-001 was sent on 2026-03-20T11:26Z

All directly linked activities:

2026-03-17T05:08:00-CME-001

2026-03-17T06:38:00-CME-001

2026-03-17T08:23:00-CME-001

2026-03-17T10:53:00-CME-001

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