Viewing archive of Wednesday, 15 July 1998
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 1998 Jul 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 196 Issued at 2200Z on 15 JUL 1998IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z
SOLAR ACTIVITY WAS LOW. THE LARGEST EVENT OF THE PERIOD
WAS A C6/SF WITH MINOR CENTIMETRIC RADIO BURSTS FROM REGION 8270
(S21W00). REGION 8270 ALSO PRODUCED SEVERAL SMALL C-CLASS FLARES.
SLIGHT DECAY OCCURRED IN THIS REGION BUT SMALL AREAS OF MAGNETIC
COMPLEXITY REMAINED. NEW REGION 8272 (S28E56) PRODUCED A C5/SF AT
15/1046Z. THIS REGION IS A SMALL CLASS B SUNSPOT GROUP. NEW REGION
8273 (S27E22) EMERGED AT A MODERATE PACE NEAR THE BASE OF AN
EXISTING FILAMENT.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN
PREDOMINANTLY LOW WITH REGIONS 8270 AND 8273 PRODUCING OCCASIONAL
C-CLASS FLARES. REGION 8270 RETAINS THE CAPABILITY OF PRODUCING AN
ISOLATED M-CLASS EVENT BUT THAT POSSIBILITY IS DECREASING AS THE
REGION DECAYS. PAST STATISTICAL STUDIES INDICATE THE PRE-EXISTING
FILAMENT NEAR EMERGING REGION 8273 COULD ERUPT IN THE NEAR FUTURE.
IF ERUPTION OCCURS, IT IS NOT LIKELY THAT A LARGE SPOTLESS FLARE
WOULD OCCUR SINCE THE MAGNETIC FIELD STRENGTHS AROUND THE FILAMENT
ARE LOW.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD
BECOME QUIET TO UNSETTLED FOR 16-17 JUL. ISOLATED PERIODS OF ACTIVE
CONDITIONS ARE POSSIBLE DURING THAT PERIOD AS A RESULT OF THE M4/1B
FLARE ON 14 JUL. PREDOMINANTLY QUIET LEVELS ARE EXPECTED TO RETURN
ON 18 JUL.
III. Event Probabilities 16 JUL to 18 JUL
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 15 JUL 105 Predicted 16 JUL-18 JUL 107/108/109 90 Day Mean 15 JUL 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 14 JUL 002/004 ESTIMATED AFR/AP 15 JUL 002/006 PREDICTED AFR/AP 16 JUL-18 JUL 010/013-012/010-008/008
VI. Geomagnetic Activity Probabilities 16 JUL to 18 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 10% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 10% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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