Viewing archive of Sunday, 16 April 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 Apr 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 107 Issued at 2200Z on 16 APR 2000IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY WAS LOW. REGION 8955 (S21E07) ENDURES AS
THE MOST COMPLEX AND ACTIVE REGION ON THE SUN. THIS REGION PRODUCED
A C6/SF AT 15/2143UT AND A C6/1N AT 16/0015UT. BOTH EVENTS WERE
ACCOMPANIED BY MINOR CENTIMETRIC BURSTS. NO SIGNIFICANT CHANGES WERE
OBSERVED IN THE OVERALL SIZE OF THIS REGION, BUT SOME DECREASE IN
COMPLEXITY WAS NOTED. REGIONS 8957 (S12W90) AND 8959 (S17W25) ALSO
PRODUCED MINOR C-CLASS X-RAY FLARES. NEW REGION 8964 (N34E21) WAS
NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. ISOLATED M-CLASS EVENTS ARE STILL POSSIBLE FROM REGION
8955.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD WAS AT UNSETTLED TO MINOR STORM LEVELS. MINOR
STORMING BEGAN AFTER A WEAK SHOCK WAS OBSERVED PASSING THE ACE
SPACECRAFT AT 16/0951UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD
REMAIN PREDOMINANTLY UNSETTLED TO ACTIVE WITH OCCASIONAL MINOR
STORMING AT HIGH LATITUDES. ACTIVE CONDITIONS MAY BE PROLONGED
THROUGH DAYS TWO AND THREE BY THE ARRIVAL OF A DISTURBANCE FROM THE
M4/CME EVENT ON 15/1018UT.
III. Event Probabilities 17 APR to 19 APR
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 APR 159 Predicted 17 APR-19 APR 160/160/165 90 Day Mean 16 APR 184
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 APR 007/007 ESTIMATED AFR/AP 16 APR 022/024 PREDICTED AFR/AP 17 APR-19 APR 015/015-015/018-012/012
VI. Geomagnetic Activity Probabilities 17 APR to 19 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 30% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 50% | 35% |
| Minor storm | 30% | 30% | 20% |
| Major-severe storm | 15% | 15% | 05% |
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