Geophysical report

Viewing archive of Wednesday, 1 October 2025

Solar and Geophysical Activity Summary 2025 Oct 01 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 274 Issued at 0245Z on 01 Oct 2025 This report is compiled from data received at SWO on 30 Sep

A. Energetic Events

Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
 0019 0023 0034  4230        C3.0     110                           
 0051 0056 0058  4232        M1.2     1700   120                    
 0535 0536 0539  4232 N04E28       Sf 110                           
 0750 0750 0750                       170                           
 0929 0940 0945  4226 S17W61 M2.7  1n                               
 1032 1032 1032                       120                           
 1202 1227 1248  4238 S15W36 M1.8  Sf                               
 2009 2009 2010                       360                           
 2019 2019 2019                       150                           
 2350 2350 2350                       200

B. Proton Events

None

C. Geomagnetic Activity Summary

The geomagnetic field reached strong storm levels

D. Stratwarm

Not available

E. Daily Indices: (real-time preliminary/estimated values)

10 cm 187  SSN 171  Afr/Ap 043/075   X-ray Background C1.7
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 5.0e+05   GT 10 MeV 1.5e+04 p/(cm2-ster-day)
(GOES-18 satellite synchronous orbit W137 degrees)
Daily Electron Fluence
GT 2 MeV 1.40e+07 e/(cm2-ster-day)
(GOES-19 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 4 6 6 5 6 5 4 5 Planetary 5 7 6 5 6 6 5 6

F. Comments

  CME/CH HSS activity persists

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Space weather facts

Last X-flare	2026/03/30	X1.4
Last M-flare	2026/03/28	M1.3
Last geomagnetic storm	2026/03/25	Kp5+ (G1)

Spotless days
Last 365 days	3 days
2026	3 days (3%)
Last spotless day	2026/02/24

Monthly mean Sunspot Number
February 2026	78.2 -34.3
Last 30 days	90 +16.9

This day in history*

Solar flares
1	2001	M7.89
2	2017	M6.34
3	2001	M5.75
4	2025	M5.6
5	2024	M3.9

		Dst	G
1	1960	-327	G4
2	2001	-228	G2
3	1976	-218	G4
4	1973	-211	G4
5	1989	-93	G2

*since 1994

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