Viewing archive of Saturday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 148 Issued at 2200Z on 27 MAY 2000IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY WAS LOW. ONLY A FEW SMALL C-CLASS FLARES
OCCURRED. THE MOST ACTIVE SUNSPOT GROUPS WERE REGIONS 9017 (S13E42)
AND 9018 (S21W24). BOTH GROUPS HAVE GROWN BUT NEITHER HAS PRODUCED
SIGNIFICANT ACTIVITY. NEW REGION 9020 (N03E06) EMERGED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS ACTIVITY SHOULD CONTINUE AND THE POSSIBILITY OF
AN ISOLATED M-CLASS FLARE REMAINS.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT WAS MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE FIRST DAY OR SO OF THE
FORECAST PERIOD. UNSETTLED TO ACTIVE CONDITIONS ARE POSSIBLE BY THE
THIRD DAY DUE TO CORONAL HOLE EFFECTS.
III. Event Probabilities 28 MAY to 30 MAY
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 MAY 162 Predicted 28 MAY-30 MAY 155/150/145 90 Day Mean 27 MAY 195
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 MAY 019/023 ESTIMATED AFR/AP 27 MAY 010/012 PREDICTED AFR/AP 28 MAY-30 MAY 010/015-012/025-015/018
VI. Geomagnetic Activity Probabilities 28 MAY to 30 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 05% | 05% | 05% |
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