Viewing archive of Saturday, 29 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 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 149 Issued at 2200Z on 29 MAY 1999IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z SOLAR ACTIVITY WAS MODERATE. AN M1 X-RAY FLARE WITH
MINOR RADIO BURSTS AND A TYPE II SWEEP OCCURRED AT 29/0304Z. A CME
OBSERVED AT THE SAME TIME SUGGEST THE EVENT ORIGINATED ON THE SE
LIMB. REGION 8552 (N18W06) CONTINUES TO EXHIBIT SOME MAGNETIC
COMPLEXITY BUT HAS YET TO PRODUCE ANY SIGNIFICANT ACTIVITY. SPOTS IN
THE SOUTHERN PORTION OF REGION 8557 (S28E48) APPEAR TO BE A SEPARATE
BIPOLE, THUS WERE NUMBERED AS REGION 8560 (S23E50). NEW REGION 8561
(N22E18) WAS ALSO NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS FLARES ARE POSSIBLE FROM SEVERAL REGIONS AND AN
ISOLATED M-CLASS IS POSSIBLE FROM REGION 8522 OR THE REGION
8557/8560 COMPLEX IN THE SE QUADRANT,
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET WITH ISOLATED UNSETTLED
PERIODS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET TO UNSETTLED. THE TREND WILL BE FOR MORE
UNSETTLED CONDITIONS AS A SOUTHERN CORONAL HOLE MOVES INTO A
GEOEFFECTIVELY FAVORABLE POSITION. INDICATIONS NOW ARE THAT THE
IMPRESSIVE HALO/CORONAL MASS EJECTION OBSERVED ON THE 27TH LIKELY
ORIGINATED FROM BEHIND THE LIMB - NO GEOMAGNETIC ACTIVITY IS
EXPECTED FROM THIS EVENT.
III. Event Probabilities 30 MAY to 01 JUN
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 29 MAY 149 Predicted 30 MAY-01 JUN 155/155/160 90 Day Mean 29 MAY 130
V. Geomagnetic A Indices
OBSERVED AFR/AP 28 MAY 007/009 ESTIMATED AFR/AP 29 MAY 007/010 PREDICTED AFR/AP 30 MAY-01 JUN 012/020-010/012-008/010
VI. Geomagnetic Activity Probabilities 30 MAY to 01 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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