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High Speed Stream
Catalog: M2M_CATALOG
Event Time: 2025-10-19T05:32Z ( ACE: MAG )

All Detecting Spacecrafts:

ACE: MAG

ACE: SWEPAM

DSCOVR: PLASMAG

Activity ID: 2025-10-19T05:32:00-HSS-001 (version 4)
Event End Time:
Peak Solar Wind Speed (km/s):
Date of first appearance of coronal hole in EUV at east limb: 2025-10-11
Note: The start of the high speed stream at L1 is likely obscured by a sequence of arrivals of CMEs, so the start of high speed stream might be even earlier. There are gradual increases in solar wind speed from ~400 km/s to ~560 km/s and in ion temperature, as well as rapid oscillations of magnetic field components characteristic of a high speed stream. A possible flux rope is embedded in this signature starting around 2025-10-18T15:30Z, with Bz turning negative for almost 12 hours. This coronal hole high speed stream is likely associated with a coronal hole spanning S10 to N40 which reached the central meridian of the Earth-facing disk on 2025-10-16.

Version 1 submitted on 2025-10-20T00:42Z by Anna Chulaki
Version 2 submitted on 2025-10-20T00:49Z by Anna Chulaki
Version 3 submitted on 2025-10-20T15:26Z by Elizabeth Juelfs
Version 4 submitted on 2025-10-21T18:22Z by Tony Iampietro

No Notification has been sent for this activity yet.

All directly linked activities:

2025-10-18T14:30:00-IPS-001
Location: Earth

2025-10-18T18:00:00-GST-001
NOAA Kp: 6.0 (2025-10-18T21:00Z)

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