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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: Earth
Event Time: 2026-04-25T19:28Z ( ACE: MAG )
All Detecting Spacecrafts:
ACE: MAG
ACE: SWEPAM
DSCOVR: PLASMAG
Activity ID: 2026-04-25T19:28:00-IPS-001 (version 1)
Quality of ICME Signature: 2 (clear signatures)
Note: Characterized by a rise in B_total from ~5nT to ~11.6nT, alongside an increase in solar wind speed from ~360km/s to ~500 km/s starting at 2026-04-25T18:47Z. B_z sustained southward initially reaching a maximum of -9.7nT, but rotated northward and became less smoothly oriented as the structure advanced. Density increases to ~13p/cc prior to the event onset time, where it rapidly drops to background levels. Temperature data is on a slow rise alongside the solar wind speed, tapering off while speed stays increased as the signature advances. This is likely a combination of CME 2026-04-23T05:12Z and ongoing coronal hole high speed stream 2026-04-24T23:40Z (see its entry for more details) which the CME arrival likely interacted with and briefly interrupted, as the basis for this entry. This structure largely resembles a coronal hole high speed stream, with the exception of a flux-rope like rotation between onset time and approximately 2026-04-26T01:00Z. After 2026-04-26T14:00Z, magnetic field rapidly drops back to background levels, with solar wind remaining elevated until 2026-04-28. It is also notable that the coronal hole responsible for the high speed stream is a southern hemisphere feature, and the CME interaction was from N16E40 (AR 14420), separated by a large distance on the solar disk. 
Version 1 submitted on 2026-04-28T18:43Z by Tony Iampietro
No Notification has been sent for this activity yet.

All directly linked activities:
2026-04-23T05:12:00-CME-001
2026-04-24T23:40:00-HSS-001


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