Viewing archive of Sunday, 30 July 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 Jul 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 212 Issued at 2200Z on 30 JUL 2000IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z SOLAR ACTIVITY HAS BEEN LOW. THE LARGEST EVENT OF THE
DAY WAS AN OPTICALLY UNCORRELATED C7 FLARE AT 30/1210Z. SOHO/EIT
IMAGERY SUGGESTS REGION 9107 (S18E56) AS THE LIKELY SOURCE. A C4/SF
FLARE WAS OBSERVED IN REGION 9105 (N16E40) AT 30/1314Z, AND REGION
9103 (N11W26) PRODUCED SEVERAL SUBFAINT FLARES WITHOUT NOTABLE X-RAY
ENHANCEMENT. SOME SMALLER C-CLASS FLARES WERE ALSO OBSERVED DURING
THE DAY, BUT WITHOUT OPTICAL CORRELATION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO PERSIST
AT THE LOW LEVEL FOR THE NEXT THREE DAYS, WITH A SLIGHT INCREASE IN
CHANCES FOR ISOLATED MODERATE-LEVEL ACTIVITY BY THE THIRD DAY DUE TO
RETURNING REGIONS EXPECTED ON THE EAST LIMB.
IIA. GEOPHYSICAL ACTIVITY SUMMARY 29/2100Z TO 30/2100Z:
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED, WITH ISOLATED
ACTIVE PERIODS OF LOCAL SUBSTORMING OBSERVED IN THE NIGHTTIME
SECTOR.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE PREDOMINANTLY QUIET TO UNSETTLED, WITH A GREATER
CHANCE OF ACTIVE PERIODS AND ISOLATED MINOR STORMING AT HIGHER
LATITUDES FROM INFLUENCE OF CORONAL HOLES EXPECTED ON DAY TWO AND
THREE.
III. Event Probabilities 31 JUL to 02 AUG
| Class M | 20% | 20% | 25% |
| Class X | 01% | 01% | 05% |
| Proton | 01% | 01% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 30 JUL 150 Predicted 31 JUL-02 AUG 150/155/155 90 Day Mean 30 JUL 189
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 JUL 017/027 ESTIMATED AFR/AP 30 JUL 010/009 PREDICTED AFR/AP 31 JUL-02 AUG 008/008-012/018-012/018
VI. Geomagnetic Activity Probabilities 31 JUL to 02 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 30% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 35% | 35% |
| Minor storm | 10% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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