Viewing archive of Friday, 19 February 1999

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 1999 Feb 19 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 050 Issued at 0245Z on 19 FEB 1999 This report is compiled from data received at SWO on 18 FEB
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0110 0110 0111                       1400
0316 0329 0336              C5.1     820
0514 0514 0515                       1600
0543 0544 0544                       1200
0549 0549 0551                       1600
0603 0603 0604                       1300
0618 0618 0618                       650
1215 1215 1217                       930
1219 1236 1241  8462 N20W34 C2.0  SF 530
1244 1244 1246                       430
1312 1312 1313                       640
1324 1325 1329  8458 S21W47       SF 660
1351 1351 1352                       8100
1402 1404 1405                       190
1408 1409 1410                       1700
1434 1434 1434                       14000
1514 1514 1514                       720
1522 1522 1523                       680
1659 1700 1702                       830
2353 0005 0007  8464 N20W11 C1.1  SF 420
B. Proton Events
None
C. Geomagnetic Activity Summary
THE GEOMAGNETIC FIELD WAS AT ACTIVE TO SEVERE STORM LEVELS THROUGHOUT THE PERIOD. A SUDDEN STORM COMMENCEMENT MEASURING 43 NANOTESLAS AT BOULDER, OCCURRED AT 18/0250Z. THE ACE SPACECRAFT MEASURED SOLAR WIND VELOCITIES NEAR 700 KM/S, AND SOUTHWARD IMF OF APPROXIMATELY 20 NT, FOR HOURS FOLLOWING THE PASSAGE OF THE SHOCK. THE SOLAR ORIGIN OF THIS ACTIVITY IS THOUGHT TO BE THE LONG-DURATION M-CLASS EVENT FROM NEAR CENTER DISK, EARLY ON FEBRUARY 16. A FORBUSH DECREASE BEGAN EARLY IN THE DAY, AS MEASURED BY NEUTRON MONITOR DATA.
D. Stratwarm
STRATWARM ALERT/THURSDAY/STRATWARM EXISTS. INTENSIFYING WARMING OVER NORTHEASTERN / EASTERN SIBERIA AND ALEUTIAN AREA CONTINUES. THE WARM AIR SPREADING NORTHWARDS. A SECOND INTENSIFYING WARMING EXISTS OVER BLACK SEA, INFLU- ENCING THE EUROPEAN PART OF RUSSIA.
E. Daily Indices: (real-time preliminary/estimated values)
10 CM 168  SSN 135  AFR/AP 063/054   X-RAY BACKGROUND B8.9
DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS)
GT 1 MEV 6.5E+06   GT 10 MEV 1.2E+04 P/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
DAILY ELECTRON FLUENCE
GT 2 MEV 8.70E+05 E/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
3 HOUR K-INDICES:
BOULDER 4 5 6 7 7 4 3 4 PLANETARY 4 6 5 6 7 5 4 4
F. Comments
  None


All times in UTC

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