Viewing archive of Saturday, 20 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 20 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 110 Issued at 0245Z on 20 Apr 2002 This report is compiled from data received at SWO on 19 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep None
B. Proton Events
None
C. Geomagnetic Activity Summary
The geomagnetic field ranged from
unsettled to major storm. A shock was observed at ACE at 19/0804 UTC
and was followed by an SI at ground magnetometers (36 nT at Boulder)
at 19/0836 UTC. This shock is believed to be associated with the LDE
M2/CME that occurred on 17 April.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 180 SSN 182 Afr/Ap 035/044 X-ray Background B8.6 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 5.4e+07 GT 10 MeV 1.9e+05 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 2.80e+07 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 3 4 3 5 5 5 5 5 Planetary 4 4 4 6 6 5 5 5
F. Comments
The 19 April Afre reported in Part E is estimated from Boulder observations.
All times in UTC
Latest news
Sunday, 8 December 2024
X2.2 solar flare, SDO outage
Thursday, 21 November 2024
Major far side eruption, S1 radiation storm
Monday, 11 November 2024
Coronal hole faces Earth
Latest forum messages
Strong far side CME 332Unspecified geomagnetic activity 1750Incoming & Unnumbered Active Regions 1352Power transmission for all of us. And why I believe we are better prepared than ever for major solar events 9Filaments and prominences 595
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/22 | M1.0 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2024 | 152.5 -13.9 |
| December 2024 | 103.3 -49.2 |
| Last 30 days | 115.4 -40.8 |