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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG Location: Earth Event Time: 2025-04-15T16:36Z ( DSCOVR: PLASMAG ) Quality of ICME Signature: 2 (clear signatures) Note: Arrival signature is indicative of a significant CME shock followed by a sheath and is characterized by a sharp amplification of magnetic field components with Btotal initially jumping from 6nT at 2025-04-15T16:36Z to 17nT at 2025-04-15T16:38Z, and eventually increasing to over 38 nT. A subsequent increase in the solar wind speed is observed, increasing from 400 km/s at 2025-04-15T16:36Z to ~480 km/s at 16:37Z, and eventually exceeding 650 km/s. Density initially increased to 35 p/cc and finally to over 50 p/cc. Early on 4/16 there is likely a flux rope signature. The signature is complex, possibly indicating there are multiple flux rope arrivals. This signature is likely associated with the combined arrival of several CMEs associated with significant filament eruptions predicted to impact NASA missions near Earth: CMEs first seen in SOHO LASCO C2 at 2025-04-13T08:00Z and 2025-04-13T08:12Z, possibly combined with the earlier slower CME: 2025-04-13T00:12Z. There were also other potentially Earth-directed CMEs which could have been swept into the front of the above fast CMEs, including two more western CMEs predicted to give Earth glancing blows: 2025-04-12T00:48Z and 2025-04-13T07:48Z CMEs. Submitted on 2025-04-18T16:14Z by Mary Aronne A Notification with ID 20250415-AL-002 was sent on 2025-04-15T17:20Z |
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