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High Speed Stream
Catalog: M2M_CATALOG
Event Time: 2026-04-22T08:00Z ( STEREO A: IMPACT )

All Detecting Spacecrafts:

STEREO A: IMPACT

STEREO A: PLASTIC

Activity ID: 2026-04-22T08:00:00-HSS-001 (version 2)
Event End Time:
Peak Solar Wind Speed (km/s): 650.0
Date of first appearance of coronal hole in EUV at east limb:
Note: Characterized by an increase in solar wind speed from ~350 km/s to ~650 km/s at 2026-04-22T10:00Z. Around this time, density exhibits a decrease from ~5 p/cc to <1 p/cc. A co-rotating interaction region precedes this signature starting around 2026-04-22T02:42Z, where Btotal increases to 20nT. The candidate coronal hole reached the central meridian of the STEREO A-facing disk on 2026-04-19 and spans approximately S20 to N40.

Version 1 submitted on 2026-04-22T15:13Z by Mattie Anastopulos
Version 2 submitted on 2026-04-28T20:21Z by Mary Aronne

No Notification has been sent for this activity yet.

All directly linked activities:

2026-04-22T02:42:00-IPS-001
Location: STEREO A

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