Viewing archive of Sunday, 30 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 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 121 Issued at 2200Z on 30 APR 2000IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z SOLAR ACTIVITY WAS LOW. REGION 8976 (S11W25) PRODUCED
THE LARGEST EVENT OF THE PERIOD, A C7/1N FLARE WITH AN ACCOMPANYING
TYPE II RADIO SWEEP (VELOCITY = 700 KM/S) AT 30/0808UT. IMAGES FROM
THE LASCO SPACECRAFT INDICATE THAT A POSSIBLY EARTH-DIRECTED CORONAL
MASS EJECTION (CME) ALSO OCCURRED IN CONJUNCTION WITH THIS EVENT.
THE TWO LARGEST REGIONS ON THE DISK, 8970 (S17E44) AND 8971
(N21W48), SHOWED SIGNS OF DECAY BUT STILL PRODUCED OCCASIONAL
OPTICAL SUBFLARES. OLD REGION 8948 SHOULD ROTATE ONTO THE DISK
TOMORROW. EIT IMAGERY HAS SHOWN CONSIDERABLE ACTIVITY FROM THIS
RETURNING REGION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
THE RETURNING REGION 8948 COULD PRODUCE ISOLATED M-CLASS EVENTS.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED. THE CME DESCRIBED IN SECTION IA
COULD CAUSE ACTIVE CONDITIONS ON THE THIRD DAY OF THE PERIOD,
DEPENDING ON HOW CLOSE IT COMES TO EARTH.
III. Event Probabilities 01 MAY to 03 MAY
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 30 APR 170 Predicted 01 MAY-03 MAY 175/180/180 90 Day Mean 30 APR 189
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 APR 012/012 ESTIMATED AFR/AP 30 APR 010/012 PREDICTED AFR/AP 01 MAY-03 MAY 010/010-010/010-015/020
VI. Geomagnetic Activity Probabilities 01 MAY to 03 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 30% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 40% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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