Geophysical report

Viewing archive of Friday, 18 December 1998

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 1998 Dec 18 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 352 Issued at 0245Z on 18 DEC 1998 This report is compiled from data received at SWO on 17 DEC

A. Energetic Events

Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0740 0745 0749  8409 S27W46 M3.2  1N 6500   200    II
1412 1418 1422  8409 S28W51 C7.2  SN 610    96     II
1458 1458 1458                       130
1746 1753 1757  8415 N17E70 C6.4  1F 110    31
1809 1815 1837  8408 S16W66 C4.5  SF 190

B. Proton Events

None

C. Geomagnetic Activity Summary

QUIET

D. Stratwarm

STRATWARM ALERT/THURSDAY/STRATWARM EXISTS. MAJOR WARMING EXISTS. A STRONG ANTICYCLONE AND A VERY INTENSE WARMING OVER THE SI- BERIAN/CANADIAN ARCTIC DOMINATE THE POLAR REGION AND DISPLA- CE THE VORTEX CENTRE TO THE CENTRAL URAL AREA. MEAN ZONAL WIND AT 60N IS FROM EAST AT 10HPA AND ABOVE IN THE UPPER STRATOSPHERE AND THE TEMPERATURE GRADIENT REVERSED BETWEEN 60N AND THE POLE IN THE WHOLE STRATOSPHERE.

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

10 CM 146  SSN 093  AFR/AP 000/002   X-RAY BACKGROUND B5.8
DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS)
GT 1 MEV 1.7E+05   GT 10 MEV 1.6E+04 P/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
DAILY ELECTRON FLUENCE
GT 2 MEV 1.00E+07 E/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
3 HOUR K-INDICES:
BOULDER 0 0 1 0 0 1 0 0 PLANETARY 0 0 0 0 0 1 1 0

F. Comments

  None

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