Viewing archive of Thursday, 1 July 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 Jul 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 182 Issued at 2200Z on 01 JUL 1999IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z SOLAR ACTIVITY DECLINED TO LOW LEVELS. SUBFLARE
ACTIVITY OCCURRED WITHIN A VARIETY OF REGIONS. HOWEVER, REGIONS 8603
(S14W25) AND 8611 (S25E07) WERE RESPONSIBLE FOR THE BULK OF THE
FLARING. REGION 8611 SHOWED A SMALL INCREASE IN AREA DUE TO
PENUMBRAL DEVELOPMENT AND CONTINUED TO SHOW SOME MIXING OF
POLARITIES. IT PRODUCED THE LARGEST FLARE OF THE PERIOD: A C8/SF AT
01/1748Z. REGION 8603 ALSO SHOWED SOME POLARITY MIXING, BUT NO
GROWTH WAS EVIDENT. IT PRODUCED ISOLATED C-CLASS SUBFLARES INCLUDING
A C5/SF AT 01/0147Z WITH A WEAK TYPE II RADIO SWEEP (EST. SHOCK
VELOCITY 600 KM/SEC). NEW REGIONS 8614 (N19E72) AND 8615 (S29E77)
WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE WITH A GOOD CHANCE FOR ISOLATED, LOW-LEVEL M-CLASS
FLARES.
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS DURING MOST OF THE
PERIOD. HOWEVER, THERE'S ALSO A CHANCE FOR ACTIVE PERIODS DURING THE
FIRST TWO DAYS IN RESPONSE TO A FAINT HALO CME SEEN ON 30 JUNE.
III. Event Probabilities 02 JUL to 04 JUL
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 JUL 195 Predicted 02 JUL-04 JUL 195/190/180 90 Day Mean 01 JUL 147
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 JUN 003/005 ESTIMATED AFR/AP 01 JUL 009/012 PREDICTED AFR/AP 02 JUL-04 JUL 012/012-010/010-007/008
VI. Geomagnetic Activity Probabilities 02 JUL to 04 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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