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High Speed Stream
Catalog: M2M_CATALOG
Event Time: 2025-12-21T00:29Z ( DSCOVR: PLASMAG )

All Detecting Spacecrafts:

DSCOVR: PLASMAG

ACE: SWEPAM

ACE: MAG

Activity ID: 2025-12-21T00:29:00-HSS-001 (version 2)
Event End Time:
Peak Solar Wind Speed (km/s): 800.0
Date of first appearance of coronal hole in EUV at east limb: 2025-12-16
Note: High speed stream/co-rotating interaction region signature characterized by phi angle change starting around 2025-12-20T01:21Z with no magnetic field enhancement or much change in solar wind parameters, then a gradual increase in density through late 2025-12-21 to 15 particles/cc with some magnetic field increases to 10 nT late on 2025-12-20, then decreasing density and increasing wind speed from 400 to 700 km/s throughout much of 2025-12-21 and later 800 km/s on 2025-12-22 with field enhancement to 15 nT in association with an equatorial coronal hole stretching from E05 to W20.

Version 1 submitted on 2025-12-21T13:41Z by Chris Stubenrauch
Version 2 submitted on 2025-12-22T19:59Z by Chris Stubenrauch

No Notification has been sent for this activity yet.

All directly linked activities:

2025-12-23T08:55:00-RBE-001

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