Viewing archive of Saturday, 18 April 2026
Geophysical report
Solar and Geophysical Activity Summary 2026 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 2026 This report is compiled from data received at SWO on 17 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0410 0410 0410 140 0419 0420 0420 220 0422 0422 0422 190 0427 0442 0502 4419 N12E29 C4.1 Sf 120 0558 0558 0558 120 0609 0609 0609 110 0612 0612 0612 120 0811 0811 0811 250 1024 1024 1024 100 1518 1518 1518 100 1525 1525 1525 140 1545 1545 1545 110 1938 1938 1938 170 1952 1953 1953 370 2106 2115 2121 B5.9 100 2244 2244 2244 100
B. Proton Events
None
C. Geomagnetic Activity Summary
Geomagnetic field activity was
quiet.
D. Stratwarm
Not available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 107 SSN 050 Afr/Ap 003/??? X-ray Background B3.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.8e+06 GT 10 MeV 1.7e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 1.00e+08 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) 3 Hour K-indices Boulder 0 0 0 1 1 2 2 2 Planetary 1 1 0 1 0 1 2 ?
F. Comments
None
All times in UTC
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Space weather facts
| Last X-flare | 2026/07/04 | X1.3 |
| Last M-flare | 2026/07/12 | M1.19 |
| Last geomagnetic storm | 2026/07/04 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| June 2026 | 94.4 -7.1 |
| July 2026 | 74.8 -19.6 |
| Last 30 days | 87 -20.2 |
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