Viewing archive of Wednesday, 31 March 1999
Solar activity 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.
Report of Solar-Geophysical Activity 1999 Mar 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 090 Issued at 2200Z on 31 MAR 1999IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z SOLAR ACTIVITY WAS VERY LOW. ONE NEW SPOT GROUP WAS
NUMBERED, REGION 8505 (N10W56).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
VERY LOW WITH A CHANCE OF AN ISOLATED C-CLASS EVENT.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY UNSETTLED WITH ISOLATED QUIET
PERIODS. THE GREATER THAN 2 MEV ELECTRONS AT GEOSYNCHRONOUS ORBIT
ATTAINED MODERATE LEVELS AT 31/1200UT AND CONTINUED TILL 31/2050UT
WHEN THEY RETURNED TO BACKGROUND LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 01 APR to 03 APR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 31 MAR 102 Predicted 01 APR-03 APR 105/110/110 90 Day Mean 31 MAR 136
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 MAR 014/018 ESTIMATED AFR/AP 31 MAR 015/012 PREDICTED AFR/AP 01 APR-03 APR 015/015-015/015-012/015
VI. Geomagnetic Activity Probabilities 01 APR to 03 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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