Viewing archive of Tuesday, 4 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 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 095 Issued at 2200Z on 04 APR 2000IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z SOLAR ACTIVITY WAS MODERATE. AN M1 FLARE OCCURRED AT
04/0132UT. THIS EVENT WAS NOT REPORTED BY GROUND BASED
OBSERVATORIES, BUT IS COINCIDENT WITH ACTIVITY FROM REGION 8948
(S15E70) AS SEEN BY THE SOHO SPACECRAFT. REGION 8948 CONTAINS A CSO
SPOT GROUP AND IS IN THE AREA OF RETURNING REGION 8906. REGION 8933
(N17W70) PRODUCED A C9/2F FLARE AT 04/1541UT. THIS EVENT WAS
ACCOMPANIED BY A DSF AND IS PROBABLY THE SOURCE OF THE INCREASE OF
ENERGETIC PARTICLES SEEN AT THE GOES SPACECRAFT STARTING AROUND
04/1700UT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THERE IS A CHANCE OF M FLARES FROM REGIONS 8933, 8936,
AND 8948. REGION 8910 (N11 L=069) IS DUE TO RETURN TO THE EAST LIMB
ON 7 APRIL AND COULD INCREASE THE LEVEL OF ACTIVITY.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD HAS RANGED FROM QUIET TO MAJOR STORM. A K=6
WAS OBSERVED AT BOULDER FOR THE 0300UT TIME PERIOD. THE FIELD
RETURNED TO QUIET LEVELS BY 0900UT ONLY TO BECOME ACTIVE AGAIN BY
1500UT. SOLAR WIND DATA FROM THE ACE SPACECRAFT INDICATE THAT THIS
ACTIVITY WAS ASSOCIATED WITH CHANGES IN THE INTERPLANETARY MAGNETIC
FIELD. BZ BEGAN THE DAY AROUND -7NT, TURNED POSITIVE (10NT) AROUND
0200UT AND RETURNED NEGATIVE (-7NT) AFTER 1100UT. FLUXES OF >10MEV
PROTONS BEGAN TO INCREASE AFTER 04/1700UT, AND REACH 10PFU AT
04/2030UT. THIS INCREASE IS PROBABLY RELATED TO THE C9 FLARE FROM
REGION 8933 AS REPORTED IN PART 1A.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE.
III. Event Probabilities 05 APR to 07 APR
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 04 APR 207 Predicted 05 APR-07 APR 205/200/200 90 Day Mean 04 APR 184
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 APR 012/012 ESTIMATED AFR/AP 04 APR 022/020 PREDICTED AFR/AP 05 APR-07 APR 010/015-008/012-008/010
VI. Geomagnetic Activity Probabilities 05 APR to 07 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 10% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 15% | 15% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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