Geophysical report

Viewing archive of Sunday, 30 December 2001

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 30 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 364 Issued at 0245Z on 30 Dec 2001 This report is compiled from data received at SWO on 29 Dec

A. Energetic Events

Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0404 0411 0423              M2.1
0540 0545 0550  9751 N02W32 M1.1  1f
0905 0916 0928              M1.8
0938 0945 1006  9748 S07W85 M9.3  Sf 8000   100    II/IV
1152 1157 1204       S26E87 M1.4  Sf
1633 1647 1702              M3.3
1834 1834 1834                       150
1950 2127 2355              M1.8
2251 2256 2308  9767 S24E88 M2.8  1f

B. Proton Events

The 10 MeV integral proton flux at geosynchronous orbit followed a slow rising trend shortly after the end of the east limb X-flare of 28 December. Flux exceeded event threshold at 29/0510 UTC. Further enhancement in possible association with the shock passage (described in Part C below) resulted in a peak flux observation of 76 pfu at 29/0815 UTC. The event ended at 29/2300 UTC.

C. Geomagnetic Activity Summary

The geomagnetic field was quiet to active. An L1 shock passage was observed at approximately 29/0440 UTC, and followed by a sudden impulse of 44 nT at 29/0538 UTC. Predominantly northward IMF orientation following the shock passage mostly mitigated the potential geomagnetic response to this event, presumed to have originated from the CME activity of 26 December.

D. Stratwarm

STRATWARM ALERT EXISTS STRATWARM SATURDAY 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 2 HPA AT 60N. MAJOR WARMING IN PROGRESS.

E. Daily Indices: (real-time preliminary/estimated values)

10 cm 264  SSN 222  Afr/Ap 013/010   X-ray Background M1.6
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 3.0e+07   GT 10 MeV 1.6e+06 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 5.30e+06 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 2 4 2 2 2 4 2 3 Planetary 2 4 2 2 2 3 3 2

F. Comments

  Afr estimated from Boulder A.

All times in UTC

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