Viewing archive of Wednesday, 10 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 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 131 Issued at 2200Z on 10 MAY 2000IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z SOLAR ACTIVITY WAS LOW. THE MOST IMPRESSIVE EVENT OF
THE PERIOD BEGAN WITH THE ERUPTION OF A 5 DEGREE FILAMENT FROM
N14E16. IT WAS SOON FOLLOWED BY A LONG-DURATION 2N/C8 FLARE FROM
REGION 8990 (N14E20) AT 10/1941Z AS WELL AS TYPE II (680 KM/S) AND
TYPE IV RADIO SWEEPS. NEW REGION 8993 (S23W06) WAS NUMBERED TODAY,
CORRECTING AN EARLIER ERROR. THE PREVIOUS TWO DAYS IT WAS
INCORRECTLY REFERRED TO AS REGION 8986, WHICH HAD ACTUALLY
DISSIPATED. REGION 8994 (N11W01) WAS ALSO NUMBERED. TODAY'S
PENTICTON 10CM FLUX VALUE WAS LIKELY FLARE ENHANCED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8989 (N16W01), 8990 (N14E20), AND 8991
(N15E46) ARE ALL CAPABLE OF PRODUCING M FLARES.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET TO UNSETTLED THROUGH THE BEGINNING OF THE
PERIOD. THE ONSET OF A GEOMAGNETIC STORM IS EXPECTED LATE 11 MAY TO
EARLY 12 MAY DUE TO A FILAMENT ERUPTION AND PARTIAL HALO CME
OBSERVED ON 8 MAY. ALTHOUGH, AT THIS POINT, THERE IS NO INDICATION
OF AN APPROACHING SHOCK IN THE ACE DATA. EFFECTS OF A RECURRENT
CORONAL HOLE WILL EXTEND THE ACTIVE TO MINOR STORM CONDITIONS
THROUGH 13 MAY.
III. Event Probabilities 11 MAY to 13 MAY
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 10 MAY 179 Predicted 11 MAY-13 MAY 165/170/175 90 Day Mean 10 MAY 186
V. Geomagnetic A Indices
OBSERVED AFR/AP 09 MAY 007/011 ESTIMATED AFR/AP 10 MAY 005/007 PREDICTED AFR/AP 11 MAY-13 MAY 015/015-030/025-020/025
VI. Geomagnetic Activity Probabilities 11 MAY to 13 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 30% | 20% |
| Major-severe storm | 05% | 10% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 25% | 40% | 35% |
| Major-severe storm | 05% | 10% | 05% |
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