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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: Earth
Event Time: 2025-05-27T18:05Z ( ACE: MAG )

All Detecting Spacecrafts:

ACE: MAG

ACE: SWEPAM

DSCOVR: PLASMAG

Activity ID: 2025-05-27T18:05:00-IPS-001 (version 3)
Quality of ICME Signature: 1 (lacks some signatures)
Note: Sudden increase in B-total from 6nT to 13nT seen in ACE and DSCOVR starting at 2025-05-27T18:05Z. Gradual rotation in B-field components is observed starting around 2025-05-27T19:00Z, with Bz reaching sustained values of -7nT to -9nT from about 2025-05-27T20:00-21:00Z before gradually rotating into the positive Bz regime. There is a corresponding steady and significant increase in solar wind speed from 425 km/s to about 540 km/s, and climbing. There is a corresponding sudden and significant increase temperature in both ACE and DSCOVR data starting at 2025-05-27T19:11Z. There is an increase in density which began at about 2025-05-27T09:00Z and remained elevated for the several hours preceding the sudden increase in B-total at 2025-05-27T17:45Z. A sudden decrease in density at about 2025-05-27T19:00Z coincides with the beginning of rotation in the B-field components, possibly indicative of a flux rope arrival. Solar wind speed and density remain high and low, respectively, possibly indicative of a coronal hole high speed stream arrival. Analysis of this signature is ongoing.

Version 1 submitted on 2025-05-27T22:06Z by Hannah Hermann
Version 2 submitted on 2025-05-27T22:56Z by Hannah Hermann
Version 3 submitted on 2025-05-27T22:57Z by Hannah Hermann

A Notification with ID 20250527-AL-001 was sent on 2025-05-27T23:02Z

All directly linked activities:

2025-05-27T18:55:00-HSS-001

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