Viewing archive of Sunday, 16 May 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 May 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 136 Issued at 2200Z on 16 MAY 1999IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY HAS BEEN MODERATE. THE MOST SIGNIFICANT
ACTIVITY WAS A PAIR OF M1 X-RAY EVENTS AT 16/1346Z AND 16/1720Z.
BOTH WERE IMPULSIVE EVENTS ASSOCIATED WITH OPTICAL ACTIVITY IN
REGION 8534 (S17W76). THERE HAVE BEEN ONLY MINOR CHANGES IN THE
SIZE AND COMPLEXITY OF THE CURRENT ACTIVE REGIONS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 17 MAY to 19 MAY
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 MAY 152 Predicted 17 MAY-19 MAY 145/145/140 90 Day Mean 16 MAY 130
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 MAY 006/009 ESTIMATED AFR/AP 16 MAY 005/007 PREDICTED AFR/AP 17 MAY-19 MAY 012/018-008/012-008/010
VI. Geomagnetic Activity Probabilities 17 MAY to 19 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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