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 UTC
Prepared 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 1998

IA. 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 M30%30%30%
Class X05%05%05%
Proton05%05%05%
PCAFGREEN
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
Active30%30%10%
Minor storm15%15%05%
Major-severe storm05%05%01%
B. High Latitudes
Active30%30%10%
Minor storm15%15%05%
Major-severe storm05%05%01%
NOTICE: GOES-9 CONTINUES TO OPERATE AND XRS DATA HAVE BEEN CONTINUOUS. FAILURE COULD OCCUR AT ANY TIME. GOES-10 IS NEARING OPERATIONAL STATUS.

All times in UTC

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