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Interplanetary Shock (or CME Arrival)
Catalog: M2M_CATALOG
Location: Earth
Event Time: 2026-01-19T18:55Z ( ACE: MAG )
All Detecting Spacecrafts:
ACE: MAG
ACE: SWEPAM
DSCOVR: PLASMAG
Activity ID: 2026-01-19T18:55:00-IPS-001 (version 3)
Quality of ICME Signature: 1 (lacks some signatures)
Note: Characterized by a sharp amplification of magnetic field components with Btotal increasing from ~6nT at 2026-01-19T18:55Z to ~86nT at 2026-01-19T18:59Z. The solar wind data is likely contaminated due to a known issue with the ACE spacecraft during solar energetic particle events, however solar wind data returns around 2026-01-19T21:18Z measuring ~1000 km/s. Density increased from ~3 p/cc at 2026-01-19T18:55Z to 29 p/cc at 2026-01-19T19:02Z. Temperature observed an increase from ~65,000 K at 2026-01-19T21:15Z to ~900,000 K at 2026-01-19T21:23Z. This signature is associated with the arrival of CME: 2026-01-18T18:09Z. A large southern coronal hole which crossed the central meridian on 2026-01-15 was located to the south and west of the eruptive source for CME: 2026-01-18T18:09Z (S15E20), and while no distinct coronal high speed stream signature was identified within this arrival signature the location and size of the coronal hole may likely have influenced this CME as it traveled to and arrived at L1. 
Version 1 submitted on 2026-01-19T19:06Z by Tony Iampietro
Version 2 submitted on 2026-01-20T04:22Z by Mattie Anastopulos
Version 3 submitted on 2026-01-20T20:19Z by Tony Iampietro
A Notification with ID 20260119-AL-005 was sent on 2026-01-19T19:09Z

All directly linked activities:
2026-01-18T18:09:00-CME-001
2026-01-18T22:55:00-SEP-001
GOES-P: SEISS >10 MeV
2026-01-19T18:00:00-GST-001
NOAA Kp: 8.33 (2026-01-19T21:00Z)
NOAA Kp: 8.67 (2026-01-20T00:00Z)
NOAA Kp: 6.33 (2026-01-20T03:00Z)
NOAA Kp: 5.67 (2026-01-20T06:00Z)
NOAA Kp: 7.67 (2026-01-20T09:00Z)
NOAA Kp: 8.0 (2026-01-20T12:00Z)
NOAA Kp: 7.33 (2026-01-20T15:00Z)
NOAA Kp: 7.0 (2026-01-20T18:00Z)
NOAA Kp: 7.0 (2026-01-20T21:00Z)
NOAA Kp: 7.67 (2026-01-21T00:00Z)
NOAA Kp: 7.33 (2026-01-21T03:00Z)
NOAA Kp: 7.0 (2026-01-21T06:00Z)
NOAA Kp: 6.67 (2026-01-21T09:00Z)
NOAA Kp: 6.33 (2026-01-21T12:00Z)
2026-01-19T22:49:00-MPC-001


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