Viewing archive of Tuesday, 23 April 2002
Geophysical report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Solar and Geophysical Activity Summary 2002 Apr 23 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 113 Issued at 0245Z on 23 Apr 2002 This report is compiled from data received at SWO on 22 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0448 0506 0520 C2.1 520 0739 0739 0739 120 0800 0802 0802 530 0806 0806 0806 110 0831 0832 0832 150 1154 1210 1220 9912 N12W19 C2.8 Sf 31 II 2114 2117 2117 130 2229 2229 2230 190
B. Proton Events
The greater than 100 MeV proton event that began
at 21/0155 UTC reached a peak of 22.9 pfu at 21/1025 UTC and was in
progress as the period ended. The greater than 10 MeV proton event
that began at 21/0225 UTC reached a peak of 2520 pfu at 21/2320 UTC
and was in progress as the period ended.
C. Geomagnetic Activity Summary
Geomagnetic field activity ranged
from quiet to active levels. Active levels occurred during 22/0300 -
0600 UTC.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 170 SSN 155 Afr/Ap 013/012 X-ray Background C1.0 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 3.3e+08 GT 10 MeV 8.0e+07 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 5.60e+07 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 3 4 2 3 2 3 3 2 Planetary 3 4 2 3 3 3 2 2
F. Comments
Afr estimated, based on Boulder USGS magnetometer data.
All times in UTC
Latest news
Sunday, 1 February 2026
Complex sunspot region 4366
Monday, 19 January 2026
CME impact! S4 solar radiation storm
Sunday, 18 January 2026
X1.9 solar flare with earth-directed CME
Latest forum messages
AR4381 13AR4378 15AR 4384 7Unexplained proton activity 117Do the high-resolution sunspot counts point to more complex sunspots? 75
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Space weather facts
| Last X-flare | 2026/02/04 | X4.21 |
| Last M-flare | 2026/02/25 | M2.4 |
| Last geomagnetic storm | 2026/03/03 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (5%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| January 2026 | 112.6 -11.4 |
| March 2026 | 75.5 -37.1 |
| Last 30 days | 58.7 -66 |