Viewing archive of Friday, 18 April 2025
Geophysical report
Solar and Geophysical Activity Summary 2025 Apr 18 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 108 Issued at 0245Z on 18 Apr 2025 This report is compiled from data received at SWO on 17 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0050 0050 0050 100 0142 0142 0142 210 0147 0147 0147 150 0231 0232 0232 120 0316 0316 0317 160 0422 0424 0425 2800 1900 1900 1900 130
B. Proton Events
None
C. Geomagnetic Activity Summary
The geomagnetic field was at quie
to unsettled levels with an isolated active period.
D. Stratwarm
Not available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 151 SSN 118 Afr/Ap 011/??? X-ray Background B8.7 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.6e+06 GT 10 MeV 1.4e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 1.20e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 3 4 2 1 3 3 1 2 Planetary 3 4 2 2 3 2 1 2
F. Comments
None
All times in UTC
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| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/05/17 | M1.4 |
| Last geomagnetic storm | 2026/05/16 | Kp6- (G2) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2026 | 79.3 -6.6 |
| May 2026 | 92.2 +12.9 |
| Last 30 days | 97 +6.4 |
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