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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG Location: Earth Event Time: 2025-06-07T00:15Z ( ACE: MAG ) Quality of ICME Signature: 2 (clear signatures) Note: Characterized by an initial spike in Bt from 5nT to 6.6nT, gradually rising up to 11.8nT by 2025-06-07T12:19Z, Bz largely northward and neutral with some brief southward periods down to -10nT. Three distinct changes of the magnetic field components are observed around 2025-06-07T6:30Z, 2025-06-07T8:37Z, and 2025-06-07T11:21Z as well. Solar wind speed increased from about 400 km/s to about 420 km/s briefly, returned to about 380 km/s, then slowy rose back to around 430 km/s starting at 2025-06-07T03:51Z. A gradual rise and decrease of density begins with the initial Bt spike around 2025-06-07T00:15Z to 2025-06-07T08:42Z, with a another short jump in density from 2025-06-07T10:11Z to 2025-06-07T11:32Z. A gradual rise and decrease in temperature begins around 2025-06-07T03:00Z ending around 2025-06-07T12:20Z. | A second and more sudden increase in B-total to 15 nT and a sudden rotation in the Bz component from negative to positive occurred at 2025-06-07T20:25Z. The Bx and By components have remained at a steady orientation. There is an increase in density leading up to the second increase in B-total, which lasted from around 2025-06-07T16:00Z to 2025-06-07T20:35Z, reaching about 13 p/cc. The solar wind speed has remained at about 440 km/s and temperature has remained nominal following this second increase in B-total. This signature is likely associated with the arrival of CME 2025-06-03T07:48Z. There is a possible interaction with this CME starting around 2025-06-07T20:30, as indicated by the impulsive flip in Bz from negative to positive. Version 1 submitted on 2025-06-07T16:31Z by Tony Iampietro Version 2 submitted on 2025-06-08T02:49Z by Hannah Hermann Version 3 submitted on 2025-06-08T02:50Z by Hannah Hermann Version 4 submitted on 2025-06-09T14:49Z by Mattie AnastopulosA Notification with ID 20250608-AL-002 was sent on 2025-06-08T18:52Z |
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