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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG Location: Earth Event Time: 2025-09-21T15:54Z ( ACE: MAG ) Quality of ICME Signature: 1 (lacks some signatures) Note: Characterized by a relatively gradual amplification of magnetic field components from 1nT at 2025-09-21T15:54Z to 19nT at 2025-09-22T11:09Z. A subsequent increase in speed is observed from ~280 km/s at 2025-09-21T19:44Z to ~420 at 2025-09-22T11:10Z, with further increases following later. Additionally, a gradual increase in density is observed starting around 2025-09-21T07:00Z, reaching ~20 p/cc at 2025-09-22T00:05Z. An increase in temperature is observed later around 2025-09-22T09:45Z, which coincides with the arrival of the 2025-09-22 high speed stream. The source of this interplanetary shock is likely a corotating interaction region preceding the coronal hole high speed stream starting on 2025-09-22. The coronal hole high speed stream is associated with a northern coronal hole that reached the central meridian on 2025-09-18. Version 1 submitted on 2025-09-22T11:36Z by Mattie Anastopulos Version 2 submitted on 2025-09-25T14:34Z by Mary Aronne Version 3 submitted on 2025-09-25T15:46Z by Anna ChulakiA Notification with ID 20250922-AL-002 was sent on 2025-09-22T11:43Z |
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