Viewing archive of Monday, 31 December 2001

Geophysical report

Solar and Geophysical Activity Summary 2001 Dec 31 0245 UTC
Prepared 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 Dec
A. 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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