Viewing archive of Wednesday, 26 April 2000
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 2000 Apr 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 117 Issued at 2200Z on 26 APR 2000IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY CONTINUED AT THE LOW LEVEL. A C6/SF
FLARE FROM REGION 8970 (S15E04) AT 0923Z WAS THE DAY'S LARGEST
EVENT. THAT SPOT GROUP MEASURES OVER 1,000 MILLIONTHS IN WHITE LIGHT
AREA, BUT HAS A FAIRLY SIMPLE MAGNETIC STRUCTURE. NEARBY REGION 8971
(N18E16), STILL IMPOSING IN WHITE LIGHT, WAS STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. AN ISOLATED LOW-LEVEL M-CLASS EVENT MAY OCCUR FROM
REGION 8970 OR 8971.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED THROUGHOUT THE PERIOD.
III. Event Probabilities 27 APR to 29 APR
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 APR 190 Predicted 27 APR-29 APR 185/180/175 90 Day Mean 26 APR 187
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 APR 007/006 ESTIMATED AFR/AP 26 APR 003/007 PREDICTED AFR/AP 27 APR-29 APR 010/015-010/015-010/012
VI. Geomagnetic Activity Probabilities 27 APR to 29 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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