Viewing archive of Thursday, 10 April 1997
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 1997 Apr 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 100 Issued at 2200Z on 10 APR 1997IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z SOLAR ACTIVITY WAS VERY LOW. ONLY MINOR X-RAY ACTIVITY
WAS NOTED OVER THE PAST 24 HOURS. A SUB FAINT OPTICAL FLARE WAS
OBSERVED IN REGION 8029 (N24W34). THIS NEW-CYCLE REGION HAS SHOWN
GOOD GROWTH OVER THE PAST 24 HOURS AND IS NOW A DAO SPOT GROUP. NEW
REGION 8030 (N11W31), AN AXX SPOT GROUP, WAS NUMBERED TODAY. REGION
8027 (S28W27) CONTINUES TO DECAY AND IS NOW A MERE AXX SPOT GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. REGION 8029 HAS A FAIR CHANCE OF C-CLASS ACTIVITY AND AN
OUTSIDE CHANCE OF AN ISOLATED M-CLASS FLARE.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED AT ALL LATITUDES. A
MINOR INCREASE IN ACTIVITY AT SATELLITE ALTITUDE AND HIGH LATITUDES
BEGAN ABOUT 10/1300Z. SPACE-BASED SENSORS INDICATE INCREASED SOLAR
WIND DENSITY AND VELOCITY BEGAN AT ABOUT 10/1300Z, PROBABLY IN
CONJUNCTION WITH THE FORECAST ARRIVAL OF MONDAY'S CME PLASMA CLOUD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE NEXT 48 TO 60 HOURS AS A
RESULT OF MONDAY'S CME IN CONJUNCTION WITH A WEAK, BUT FAVORABLY
POSITIONED CORONAL HOLE. THIRD DAY ACTIVITY IS EXPECTED TO GRADUALLY
DIMINISH TO MOSTLY UNSETTLED LEVELS.
III. Event Probabilities 11 APR to 13 APR
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 10 APR 078 Predicted 11 APR-13 APR 078/078/078 90 Day Mean 10 APR 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 09 APR 006/005 ESTIMATED AFR/AP 10 APR 008/008 PREDICTED AFR/AP 11 APR-13 APR 020/020-020/020-015/015
VI. Geomagnetic Activity Probabilities 11 APR to 13 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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