Viewing archive of Friday, 7 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 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 098 Issued at 2200Z on 07 APR 2000IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z SOLAR ACTIVITY HAS BEEN LOW. ONLY SMALL C FLARES HAVE
BEEN OBSERVED DURING THE PAST 24 HOURS. NEW DEVELOPMENT HAS BEEN
OBSERVED IN THE NORTHWEST PORTIONS OF REGION 8948 (S14E28) ADDING
COMPLEXITY TO THIS REGION (A DELTA MAG CONFIGURATION HAS BEEN
OBSERVED). TWO NEW REGIONS WERE NUMBERED, REGION 8951 (N11E74) AND
8952 (S24E49). REGION 8951 MAY BE THE LEADING EDGE OF RETURNING
REGION 8910.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. M-CLASS FLARES ARE LIKELY FROM REGION 8948 AND REGIONS
RETURNING TO THE NORTHEAST LIMB.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
GEOMAGNETIC ACTIVITY RANGED FROM SEVERE STORM TO UNSETTLED LEVELS.
THE GEOMAGNETIC FIELD WAS AT SEVERE LEVELS (K=8) AT THE START OF THE
DAY. ACTIVITY DECREASED TO ACTIVE LEVELS BY MID DAY AND THE FIELD
IS CURRENTLY AT UNSETTLED LEVELS. THE SOLAR WIND, AS OBSERVED BY
THE ACE SPACECRAFT, SHOWS THAT THE BULK OF THE DISTURBANCE PRODUCING
THIS STORM HAD PASSED THE SPACECRAFT BY 0800UT. THE SOLAR WIND
SPEED STILL REMAINS ELEVATED AT 600KM/S. A MINOR FORBUSH DECREASE
IS CURRENTLY BEING OBSERVED BY THE THULE NEUTRON MONITOR.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 08 APR to 10 APR
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 07 APR 175 Predicted 08 APR-10 APR 180/185/190 90 Day Mean 07 APR 185
V. Geomagnetic A Indices
OBSERVED AFR/AP 06 APR 034/056 ESTIMATED AFR/AP 07 APR 051/063 PREDICTED AFR/AP 08 APR-10 APR 010/030-008/015-005/010
VI. Geomagnetic Activity Probabilities 08 APR to 10 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 30% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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