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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: STEREO A
Event Time: 2026-01-21T03:04Z ( STEREO A: IMPACT )

All Detecting Spacecrafts:

STEREO A: IMPACT

STEREO A: PLASTIC

Activity ID: 2026-01-21T03:04:00-IPS-001 (version 3)
Quality of ICME Signature: 1 (lacks some signatures)
Note: Characterized by an amplification of magnetic field components with Btotal increasing from ~5nT at 2026-01-21T03:04Z to ~16nT at 2026-01-21T03:34Z. A minor increase in density is observed around this time to ~5 p/cc. While solar wind speed data is sparse in real-time, there may be an increase from ~400 km/s to ~600 km/s at 2026-01-21T06:05Z. This signature is likely associated with the glancing blow arrival of CME: 2026-01-18T18:09Z. Due to a data gap from 2026-01-20T15:11Z to 2026-01-21T03:04Z, the start time of this arrival may be earlier than what is currently stated.

Version 1 submitted on 2026-01-21T13:19Z by Mattie Anastopulos
Version 2 submitted on 2026-01-21T13:50Z by Mattie Anastopulos
Version 3 submitted on 2026-01-22T02:33Z by Mary Aronne

No Notification has been sent for this activity yet.

All directly linked activities:

2026-01-18T18:09:00-CME-001

2026-01-21T03:00:00-SEP-001
STEREO A: IMPACT 13-100 MeV

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