Space Weather Database Of Notifications, Knowledge, Information (DONKI)
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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG Location: Earth Event Time: 2021-09-30T18:00Z ( DSCOVR: PLASMAG ) Quality of ICME Signature: -1 (unspecified) Note: A significant arrival detected at L1 by DSCOVR. There was a sudden increase of Bt from around 3.83 nT to over 11.2 nT at around 2021-09-30T18:03Z. The arrival is also associated with a sudden drop in density. There was a possible arrival of a sheath region even earlier, around ~2021-09-30T14:15. This signature is maybe from a glancing blow of the 2021-09-28T07:00Z CME, although there might be an admixture of a minor HSS in it as well. The flux rope is not seen until 2021-10-01: from 2021-10-01T12:44Z to 2021-10-02T12:44Z, and the arrival of the flux rope is associated with the second increase of B total to about 12 nT. Submitted on 2021-10-08T16:58Z by Anna Chulaki A Notification with ID 20210930-AL-001 was sent on 2021-09-30T18:57Z |
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