Viewing archive of Friday, 28 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 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 119 Issued at 2200Z on 28 APR 2000IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z SOLAR ACTIVITY WAS LOW. ONLY TWO C-CLASS EVENTS
OCCURRED DURING THE PERIOD, THE LARGEST BEING A C5/1N WITH AN
ACCOMPANYING TYPE II RADIO SWEEP (VELOCITY - 500 KM/S) AT 28/1851UT,
FROM REGION 8967 (N19W60). THREE NEW REGION WERE NUMBERED TODAY:
8976 (S11E03), 8977 (S14W04), AND 8978 (N19E04). ALL THREE NEW
REGIONS SHOWED SIGNS OF ACTIVITY AND FAIRLY STEADY GROWTH DURING THE
DAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO CONTINUE
TO BE LOW.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED WITH ISOLATED
ACTIVE PERIODS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 29 APR to 01 MAY
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 28 APR 183 Predicted 29 APR-01 MAY 180/175/175 90 Day Mean 28 APR 188
V. Geomagnetic A Indices
OBSERVED AFR/AP 27 APR 012/013 ESTIMATED AFR/AP 28 APR 012/018 PREDICTED AFR/AP 29 APR-01 MAY 010/012-010/010-010/010
VI. Geomagnetic Activity Probabilities 29 APR to 01 MAY
| 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% |
All times in UTC
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