Viewing archive of Monday, 18 May 2026
Geophysical report
Solar and Geophysical Activity Summary 2026 May 18 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 138 Issued at 0245Z on 18 May 2026 This report is compiled from data received at SWO on 17 MayA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0329 0339 0342 4435 M1.4 0559 0559 0559 150 2042 2053 2105 4436 C9.7 150 370
B. Proton Events
None.
C. Geomagnetic Activity Summary
The geomagnetic field was quiet.
D. Stratwarm
Not available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 104 SSN 086 Afr/Ap 007/008 X-ray Background B4.7 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 4.4e+06 GT 10 MeV 2.1e+04 p/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) Daily Electron Fluence GT 2 MeV 2.90e+08 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) 3 Hour K-indices Boulder 2 3 2 3 2 2 2 2 Planetary 2 2 2 2 2 2 2 2
F. Comments
None
All times in UTC
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| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/05/22 | M2.3 |
| 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 | 87.5 +8.2 |
| Last 30 days | 98 +7.5 |
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