Viewing archive of Thursday, 29 April 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 Apr 29 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 29 APR 1999IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8524 (N22W15)
PRODUCED AN M1/1B FLARE AT 29/1954UT. THIS REGION ALSO PRODUCED A
FEW C-CLASS SUBFLARES, THE LARGEST BEING A C3/SF AT 29/1741UT.
DEVELOPMENT IN THE 8524 AREA HAS MADE IDENTIFICATION OF THE SMALL
SUNSPOT GROUP JUST TO THE SOUTH, REGION 8522 (N17W14), DIFFICULT IF
NOT IMPOSSIBLE. THESE REGIONS WILL MOST LIKELY NEED TO BE COMBINED.
NEW REGION 8525 (N15E68) ROTATED AROUND THE EAST LIMB AND HAS
ALREADY PRODUCED C-CLASS ACTIVITY, A C2/SF AT 29/0829UT. THE AREA IS
STILL COMING INTO VIEW BUT DOES NOT YET APPEAR TO BE SIGNIFICANTLY
COMPLEX. NEW REGION 8526 (N22E35) WAS ALSO NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS ACTIVITY IS EXPECTED IN REGIONS 8524 AND 8525.
AN ADDITIONAL M-CLASS FLARE IS POSSIBLE IN REGION 8524.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE. EFFECTS FROM A HIGH-SPEED STREAM
ASSOCIATED WITH A FAVORABLY POSITIONED CORONAL HOLE ARE EXPECTED TO
BEGIN WITHIN THE FORECAST PERIOD. ISOLATED MINOR STORM CONDITIONS
ARE POSSIBLE IF THIS OCCURS.
III. Event Probabilities 30 APR to 02 MAY
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 29 APR 122 Predicted 30 APR-02 MAY 125/130/135 90 Day Mean 29 APR 128
V. Geomagnetic A Indices
OBSERVED AFR/AP 28 APR 014/019 ESTIMATED AFR/AP 29 APR 015/025 PREDICTED AFR/AP 30 APR-02 MAY 015/025-015/030-015/030
VI. Geomagnetic Activity Probabilities 30 APR to 02 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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