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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: Earth
Event Time: 2025-07-26T07:37Z ( ACE: MAG )

All Detecting Spacecrafts:

ACE: MAG

ACE: SWEPAM

Activity ID: 2025-07-26T07:37:00-IPS-001 (version 4)
Quality of ICME Signature: 1 (lacks some signatures)
Note: Complex arrival signature starting with the gradual increase in magnetic field, with B total peaking and above 11 nT at ~2025-07-26T10Z, accompanied by rapid fluctuations of magnetic field components. There is rotation of one magnetic field component, with Bz very briefly turning negative (reaching almost -10nT). There is a simultaneous gradual increase in solar wind speed from ~480 to 580 km/s and a minor increase in density (to over 5 p/cc). Later, at 2025-07-26T16:20Z there is a start of a smooth rotation of all three magnetic field components, with a simultaneous drop in temperature and density, indicating the start of a flux rope. From Sanchita Pal, LASSOS team: The start time of the flux rope is likely around 2025-07-26T16:20Z, after that the density and temperature decrease. Before this timestamp, density is high. This preceding signature with high density could be because a pile-up of the solar wind material or could be a sheath. Inside the flux rope B_radial component is high, it means the flux rope can be crossed with a larger distance from the center to the spacecraft propagation path. Mostly small/no-rotation in field line vector means either(1) the CME flux rope is crossed through flank or (2) the flux rope is crossed by spacecraft keeping a large distance from the center.

Version 1 submitted on 2025-07-26T12:17Z by Anna Chulaki
Version 2 submitted on 2025-07-27T21:26Z by Anna Chulaki
Version 3 submitted on 2025-07-27T21:26Z by Anna Chulaki
Version 4 submitted on 2025-08-02T18:20Z by Anna Chulaki

No Notification has been sent for this activity yet.

All directly linked activities:

2025-07-23T04:53:00-CME-001

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