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 UTCPrepared 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 1998IA. 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 M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
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 | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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