Viewing archive of Sunday, 12 May 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 May 12 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 132 Issued at 0245Z on 12 May 2002 This report is compiled from data received at SWO on 11 MayA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 1121 1132 1141 9937 S06W31 M1.4 Sf 41 76 II 2259 2301 2316 690
B. Proton Events
None
C. Geomagnetic Activity Summary
The geomagnetic field was at quiet
to major storm levels. Data from the Advanced Composition Explorer
(ACE) showed an increase in the solar wind speed from roughly 350 to
450 km/s beginning at approximately 11/0915 UTC. The north-south
component of the interplanetary magnetic field remained strongly
negative for several hours thereafter. A sudden impulse of 41 nT
was observed at the Boulder Magnetometer at 11/1028 UTC. Major
storm conditions were observed at high latitudes from 11/1100
through 11/1800 UTC. Uncertain as to the source(s) of the activity,
although multiple CME's were seen in SOHO/LASCO imagery on the
eighth and ninth. Source regions for CME's believed to have been
from both the east and west limbs.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 188 SSN 226 Afr/Ap ???/040 X-ray Background B8.3 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 2.6e+05 GT 10 MeV 1.2e+04 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 3.40e+05 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 1 1 3 5 6 6 4 4 Planetary 2 1 3 6 6 6 5 4
F. Comments
None
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