Viewing archive of Thursday, 27 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 27 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 361 Issued at 0245Z on 27 Dec 2001 This report is compiled from data received at SWO on 26 DecA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0432 0540 0647 9742 N08W54 M7.14 1b 2600 II/IV 1025 1025 1025 170 1222 1226 1229 9742 N10W68 M1.8 1f 71 1402 1402 1402 320 1409 1412 1415 9742 N12W70 C7.4 Sf 430 1458 1458 1458 300 1606 1606 1606 140 1713 1718 1731 9742 N10W72 M1.3 Sf 2111 2115 2119 9748 S10W56 M1.2 Sf
B. Proton Events
Greater than 100 MeV and 10 MeV proton events
occurred in association with today's major flare. The greater than
100 MeV event started at 26/0555 UTC, reached a peak of 50 pfu at
26/0720 UTC, and ended at 26/1935 UTC. The greater than 10 MeV event
started at 26/0605 UTC, reached a peak of 779 pfu at 26/1115 UTC,
and continues in progress.
C. Geomagnetic Activity Summary
The geomagnetic field was quiet to
active.
D. Stratwarm
STRATWARM ALERT EXISTS STRATWARM WEDNESDAY
STRONG STRATOSPHERIC WARMING IN THE MIDDLE AND UPPER STRATOSPHERE,
INTENSIFYING. TEMPERATURE GRADIENT REVERSED BETWEEN 60N AND THE
POLE FROM 10 TO 1 HPA, WITHIN 5 DAYS EXPECTED TO BE REVERSED BETWEEN
50 TO 5 HPA. EASTERLY ZONAL REAN WINDS AT 60N FROM 3 TO 1 HPA,
WITHIN 3 DAYS EXPECTED TO PROPAGATE DOWN TO 5 HPA.
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 268 SSN 290 Afr/Ap 008/007 X-ray Background C2.9 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 5.8e+07 GT 10 MeV 2.4e+07 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 9.50e+06 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 2 1 1 1 2 4 3 2 Planetary 2 0 0 1 2 3 3 2
F. Comments
The particle event discussed in part B. was associated with a GLE starting at about 26/0600 UTC and reaching a maximum at about 26/0620 UTC (8% at Apatity, Oulu, and McMurdo, and 2% at Moscow). A Polar Cap Absorption event (PCA) also occurred, reaching a peak absorption of about 9 dB at 26/1115 UTC and continuing in progress at this writing.
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