Viewing archive of Thursday, 25 June 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 Jun 25 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 176 Issued at 2200Z on 25 JUN 1998

IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z

SOLAR ACTIVITY WAS LOW. 3 NEW NUMBERED REGIONS WERE ADDED: 8254 (N23W67), 8255 (S23E51), AND 8256 (S26E68). 8254 AND 8256 ARE SINGLE SPOT AXX GROUPS WHILE 8255 IS A 2 SPOT BXO GROUP. THE MOST ACTIVE REGION IS 8253 (N18E39), WHICH IS A 7 SPOT DSC, BETA-GAMMA GROUP. 8253 PRODUCED SEVERAL B-CLASS FLARES, 2 C-CLASS, AND 2 OPTICAL SUB FLARES. THE REST OF THE DISK IS FAIRLY QUIET AND STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE WITH CONTINUED C-CLASS AND POSSIBLE ISOLATED M-CLASS FLARES FROM REGION 8253.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO ACTIVE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO CONTINUE TO BE QUIET TO ACTIVE.
III. Event Probabilities 26 JUN to 28 JUN
Class M10%10%10%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       25 JUN 106
  Predicted   26 JUN-28 JUN  110/112/115
  90 Day Mean        25 JUN 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 JUN  013/014
ESTIMATED AFR/AP 25 JUN  010/011
PREDICTED AFR/AP 26 JUN-28 JUN  010/015-005/008-005/008
VI. Geomagnetic Activity Probabilities 26 JUN to 28 JUN
A. Middle Latitudes
Active15%15%15%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active20%20%20%
Minor storm05%05%05%
Major-severe storm01%01%01%

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