Viewing archive of Monday, 30 November 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 Nov 30 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 334 Issued at 2200Z on 30 NOV 1998

IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z

SOLAR ACTIVITY WAS LOW. SEVERAL C-CLASS FLARES OCCURRED FROM A VARIETY OF SUNSPOT GROUPS, INCLUDING 8392 (S22W46), 8395 (N22E11), AND 8396 (N28W95). REGION 8395 HAS CHANGED LITTLE SINCE YESTERDAY. THE SUNSPOTS LEADING THIS GROUP HAVE BEEN SPLIT OFF AS A SEPARATE BIPOLAR REGION AND NUMBERED 8398 (N18W05). THE SUNSPOTS TO THE NORTHEAST HAVE ALSO BEEN SPLIT OFF AS A SEPARATE GROUP AND NUMBERED 8399 (N30E23). THE REMAINING SPOTS STILL LEAVE 8395 AS A MODERATELY LARGE F-TYPE GROUP SPANNING OVER 20 DEGREES IN EXTENT. EMERGING REGIONS 8400 (S18E08) AND 8401 (N12E27) WERE ALSO NUMBERED. ADDITIONAL SUNSPOTS ARE ROTATING AROUND THE EAST LIMB BEHIND REGION 8397 (N15E64). PRELIMINARY ANALYSIS SUGGESTS THAT THESE COMPRISE A SEPARATE GROUP AND WILL MOST LIKELY BE NUMBERED AFTER A PROPER SEPARATION IS DETERMINED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. C-CLASS ACTIVITY IS EXPECTED AND MODERATE ACTIVITY IS POSSIBLE IN A NUMBER OF SUNSPOT GROUPS. REGIONS 8395, 8396, AND 8397 ARE EXPECTED TO BE THE PRIMARY FLARE PRODUCERS.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE. A WEAK SUDDEN IMPULSE WAS OBSERVED ON GROUND MAGNETOMETERS AT ABOUT 30/0512Z. ACE DID NOT SEE A STRONG SHOCK; HOWEVER, IT DID INDICATE A CHANGE IN THE SOLAR WIND STRUCTURE AT ABOUT 30/0430Z. THIS MAY BE RELATED TO THE CME DETECTED BY SOHO/LASCO ON 27 NOVEMBER.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY QUIET TO UNSETTLED WITH THE POSSIBILITY OF ISOLATED ACTIVE PERIODS.
III. Event Probabilities 01 DEC to 03 DEC
Class M40%40%40%
Class X10%10%10%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       30 NOV 163
  Predicted   01 DEC-03 DEC  160/158/156
  90 Day Mean        30 NOV 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 NOV  007/006
ESTIMATED AFR/AP 30 NOV  012/018
PREDICTED AFR/AP 01 DEC-03 DEC  015/010-010/010-010/010
VI. Geomagnetic Activity Probabilities 01 DEC to 03 DEC
A. Middle Latitudes
Active15%15%15%
Minor storm10%10%05%
Major-severe storm05%05%05%
B. High Latitudes
Active15%15%15%
Minor storm10%10%05%
Major-severe storm05%05%05%

All times in UTC

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