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High Speed Stream
Catalog: M2M_CATALOG
Event Time: 2026-09-21T12:15Z ( STEREO A: IMPACT )

All Detecting Spacecrafts:

STEREO A: IMPACT

STEREO A: PLASTIC

Activity ID: 2026-09-21T12:15:00-HSS-001 (version 1)
Event End Time:
Peak Solar Wind Speed (km/s):
Date of first appearance of coronal hole in EUV at east limb:
Note: Characterized by an increase in solar wind speed from ~400 km/s at 2026-09-21T12:15Z to ~600 km/s at 2026-09-21T14:45Z. This signature is preceded by an amplification of magnetic field components from ~8nT to ~11nT at 2026-09-21T00:33Z, likely attributed to the associated corotating interaction region. Density data is sparse but may exhibit an increase at this time, followed by a decrease starting around 2026-09-21T10:00Z. The candidate coronal hole is centered around latitude S20 and reached the center of the STEREO Ahead-facing disk on 2026-09-18.

Version 1 submitted on 2026-09-22T01:45Z by Mattie Anastopulos

No Notification has been sent for this activity yet.

All directly linked activities:

2026-09-21T00:33:00-IPS-001
Location: STEREO A

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