Viewing archive of Friday, 12 May 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 May 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 133 Issued at 2200Z on 12 MAY 2000IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY WAS LOW. THERE WERE A NUMBER OF C-CLASS
X-RAY FLARES, ALL OF THEM OPTICALLY UNCORRELATED. A 32 DEGREE
FILAMENT ERUPTED FROM ROUGHLY S50E50 BETWEEN 11/22 AND 11/23UT. THE
ERUPTION WAS VISIBLE IN EIT IMAGERY AND LASCO REVEALED A DRAMATIC
CME OFF THE SOUTH POLE. AT THIS TIME THE CME DOES NOT APPEAR TO BE
EARTH DIRECTED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THERE ARE CURRENTLY A NUMBER OF REGIONS CAPABLE OF
PRODUCING M FLARES.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO MINOR STORM LEVELS. ACE DATA
INDICATED THE PASSAGE OF TWO SOLAR TRANSIENTS, ASSUMED TO BE RELATED
TO THE MULTIPLE FILAMENT ERUPTIONS OF 8 MAY. WHILE THE TRANSIENTS
PRODUCED SUSTAINED PERIODS OF NEGATIVE BZ, THE WIND SPEED REMAINED
VERY LOW INHIBITING A STRONG GEOMAGNETIC RESPONSE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO MINOR STORM FOR THE FIRST TWO DAYS OF THE
PERIOD. ON THE FIRST DAY, WE EXPECT TO SEE INCREASES IN THE SOLAR
WIND SPEED DUE TO A SMALL CORONAL HOLE THAT IS NOW FAVORABLY
POSITIONED. A SHOCK ASSOCIATED WITH THE 10 MAY LONG DURATION FLARE
AND FILAMENT ERUPTION IS ALSO EXPECTED LATE 13 OR EARLY 14 MAY.
III. Event Probabilities 13 MAY to 15 MAY
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 MAY 190 Predicted 13 MAY-15 MAY 195/200/200 90 Day Mean 12 MAY 187
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 MAY 004/006 ESTIMATED AFR/AP 12 MAY 015/020 PREDICTED AFR/AP 13 MAY-15 MAY 020/020-015/015-008/008
VI. Geomagnetic Activity Probabilities 13 MAY to 15 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 20% |
| Minor storm | 20% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 25% |
| Minor storm | 25% | 20% | 05% |
| Major-severe storm | 05% | 05% | 01% |
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