Viewing archive of Friday, 4 June 1999
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 1999 Jun 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 155 Issued at 2200Z on 04 JUN 1999IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8552 (N19W86)
PRODUCED AN M3/2B FLARE AT 04/0703UT. THIS FLARE WAS ASSOCIATED WITH
AN INTENSITY 3 TYPE IV SWEEP AND A PARTIAL HALO CME. NUMEROUS
C-CLASS FLARES ALSO OCCURRED DURING THE PAST DAY FROM A NUMBER OF
REGIONS. NEW REGIONS NUMBERED INCLUDE 8568 (N12W55), 8569 (N18E73),
AND 8570 (S14E74).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS FLARES ARE EXPECTED AND ADDITIONAL M-CLASS
FLARES ARE POSSIBLE.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. A GREATER THAN 10 MEV
PROTON EVENT BEGAN AT 04/0925UT AND REMAINS IN PROGRESS. SO FAR THE
MAXIMUM FLUX OF THIS EVENT WAS 64 PFU AT 04/1055UT. THE EVENT SOURCE
IS PRESUMED TO BE THE M3/2B AND CME AT 04/0703UT. A PCA EVENT WAS
ASSOCIATED WITH THE PARTICLES, BEGINNING AT 04/1040UT AND REACHING A
MAXIMUM ABSORPTION OF 2.5 DB AT 04/1850UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED BECOMING UNSETTLED TO ACTIVE IN
RESPONSE TO THE CME EVENT DESCRIBED ABOVE.
III. Event Probabilities 05 JUN to 07 JUN
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | IN PROGRESS | ||
IV. Penticton 10.7 cm Flux
Observed 04 JUN 171 Predicted 05 JUN-07 JUN 170/165/160 90 Day Mean 04 JUN 133
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 JUN 009/008 ESTIMATED AFR/AP 04 JUN 010/008 PREDICTED AFR/AP 05 JUN-07 JUN 018/017-015/012-010/010
VI. Geomagnetic Activity Probabilities 05 JUN to 07 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 10% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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