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 UTCPrepared 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 FEBA. 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
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