Viewing archive of Monday, 31 December 2001
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 2001 Dec 31 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 365 Issued at 0245Z on 31 Dec 2001 This report is compiled from data received at SWO on 30 DecA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 1431 1431 1432 100 1435 1436 1437 880
B. Proton Events
The greater than 10 MeV proton flux at
geosynchronous orbit has fluctuated near the event threshold value
of 10 pfu for most of the day, though now appears to be undergoing
an enhancement due to the recent shock passage. As a result of
near-threshold activity, a 10 MeV proton event has been in progress
since 30/0245 UTC. Max flux observed today is 19 pfu, at 30/2355
UTC.
C. Geomagnetic Activity Summary
Geomagnetic field activity has
been quiet to active. Most of the day was dominated by ongoing
effects from yesterday's shock passage, with an extended period of
southward IMF producing active conditions during 30/0300-0900 UTC.
Active conditions returned late in the day, when an additional shock
passage was observed at the ACE satellite at 30/1932 UTC, followed
by a sudden impulse of 27 nT observed at Boulder at 30/2010 UTC.
This event is presumed to be an early arrival of effects from the
powerful X-class event of 28 December.
D. Stratwarm
STRATWARM ALERT EXISTS STRATWARM SUNDAY
WARM AIR COVERS MOST OF THE POLAR REGION IN THE UPPER AND MIDDLE
STRATOSPHERE, FURTHER PENETRATING DOWNWARDS. THE TEMPERATURE
GRADIENT BETWEEN 60N AND THE POLE WILL BE REVERSED DOWN TO 50
HPA, AND MEAN ZONAL EASTERLY WINDS ARE EXPECTED BETWEEN 10
AND 1 HPA AT 60N. MAJOR WARMING IN PROGRESS.
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 247 SSN 218 Afr/Ap 017/017 X-ray Background C8.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.2e+07 GT 10 MeV 8.6e+05 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 2.10e+06 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 3 4 3 2 3 3 4 3 Planetary 3 4 4 2 3 2 4 4
F. Comments
Afr estimated from Boulder A.
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