Viewing archive of Sunday, 2 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 02 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 093 Issued at 2200Z on 02 APR 2000IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z
SOLAR ACTIVITY REMAINED AT A LOW LEVEL. THE LARGEST
EVENT OF THE PERIOD WAS A LONG DURATION C6/SF FROM REGION 8936
(S15E22) FROM 02/1658-1831Z. REGION 8933 (N17W43) ALSO PRODUCED
SEVERAL SUBFLARES DURING THAT TIME. DISK REGIONS WERE PREDOMINANTLY
STABLE OR DECAYING. ACTIVE SURGING WAS VISIBLE NEAR SE17 WHERE OLD
REGION 8906 IS DUE TO RETURN.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE LOW TO
MODERATE. CURRENT DISK REGIONS ARE CAPABLE OF PRODUCING ISOLATED
M-CLASS EVENTS. OLD REGION 8906, THAT IS BEGINNING TO APPEAR AT THE
SOUTHEAST LIMB, PRODUCED 8 M-CLASS EVENTS LAST ROTATION BUT WAS
DECAYING SLOWLY DURING ITS WESTERN HEMISPHERE TRANSIT. DEPENDING
UPON ITS RATE OF DISSOLUTION DURING THE LAST TWO WEEKS, THIS AREA
COULD ELEVATE ACTIVITY LEVELS DURING THE FORECAST PERIOD.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
THE GEOMAGNETIC FIELD WAS UNSETTLED TO SLIGHTLY ACTIVE. SOLAR WIND
VELOCITY WAS SLIGHTLY OVER NOMINAL AT 450-475 KM/S.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD
REMAIN GENERALLY UNSETTLED TO SLIGHTLY ACTIVE FOR 03-04 APR. QUIET
TO UNSETTLED CONDITIONS ARE EXPECTED ON 05 APR.
III. Event Probabilities 03 APR to 05 APR
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 02 APR 219 Predicted 03 APR-05 APR 220/225/220 90 Day Mean 02 APR 183
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 APR 012/014 ESTIMATED AFR/AP 02 APR 014/018 PREDICTED AFR/AP 03 APR-05 APR 012/015-010/015-008/012
VI. Geomagnetic Activity Probabilities 03 APR to 05 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 20% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 25% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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