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Viewing archive of Wednesday, 15 July 1998

Solar activity report

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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.

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Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Gillam, MB, Whitehorse, YT, Yellowknife, NT
Fairbanks, AK
The direction of the interplanetary magnetic field is slightly South (-8.05nT).
A transequatorial coronal hole was detected in an earth-facing position on Monday, 24 March 2025

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