Viewing archive of Tuesday, 8 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 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 159 Issued at 2200Z on 08 JUN 1999IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z SOLAR ACTIVITY WAS LOW. AS HAS BEEN THE PATTERN OF THE
PAST FEW DAYS, JUST OCCASIONAL SMALL C-CLASS EVENTS OCCURRED. REGION
8574 (N28E01) WAS THE MOST ACTIVE CENTER, AND REMAINS BRIGHT IN
H-ALPHA. TWO NEW REGIONS WERE ASSIGNED; 8577 (N19W37) AND 8578
(N19E04).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD VARIED FROM QUIET TO ACTIVE. SOLAR WIND DATA
SHOW PROLONGED PERIODS OF SOUTHWARD IMF, PERHAPS ASSOCIATED WITH THE
PASSAGE OF A RECURRENT STRUCTURE ASSOCIATED WITH THE HELIOSPHERIC
CURRENT SHEET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED DURING THE NEXT 24 HOURS, WITH A CHANCE OF
ACTIVE CONDITIONS DURING LOCAL NIGHTTIMES. QUIET CONDITIONS SHOULD
PREVAIL JUNE 10-11.
III. Event Probabilities 09 JUN to 11 JUN
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 08 JUN 157 Predicted 09 JUN-11 JUN 155/150/145 90 Day Mean 08 JUN 134
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 JUN 004/004 ESTIMATED AFR/AP 08 JUN 015/012 PREDICTED AFR/AP 09 JUN-11 JUN 010/010-005/005-005/005
VI. Geomagnetic Activity Probabilities 09 JUN to 11 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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