Viewing archive of Wednesday, 29 April 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 Apr 29 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 119 Issued at 2200Z on 29 APR 1998

IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z

SOLAR ACTIVITY BECAME MODERATE. REGION 8210 (S16E19) PRODUCED A MODERATE DURATION M6/3B FLARE AT 29/1637Z. THIS EVENT WAS ACCOMPANIED BY SMALL CENTIMETRIC RADIO BURSTS AND A STRONG TYPE IV SWEPT FREQUENCY BURST THAT REMAINED IN PROGRESS AT THE END OF THE PERIOD. A MODERATE SIZE FILAMENT IN THE REGION FADED WITH THE FLARE AND A LARGE HALO CORONAL MASS EJECTION WAS OBSERVED FOLLOWING THIS EVENT. ACCORDING TO ANALYSIS BY SOHO/LASCO SCIENTISTS, THIS HALO APPEARED TO PROPAGATE MORE DIRECTLY AT THE EARTH THAN THE HALO OBSERVED ON 27 APR. PRIOR TO THIS FLARE, REGION 8210 HAD PRODUCED SEVERAL SMALL C-CLASS EVENTS. THE DELTA CONFIGURATION IN REGION 8210 FADED DURING THE PERIOD BUT SOME MIXED POLARITIES REMAINED. WHITE LIGHT AREA REMAINED CONSTANT IN THIS SMALL REGION. A SMALL REGION EMERGED NEAR N27E60 AND WAS NUMBERED AS NEW REGION 8214.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE PREDOMINANTLY LOW. REGION 8210 APPEARS TO BE ON A DOWNWARD TREND BUT MAINTAINS THE CAPABILITY OF PRODUCING ISOLATED M AND SMALL X-CLASS EVENTS. OLD REGION 8194 IS RETURNING TO THE SOUTHEAST LIMB DURING THE PERIOD, BUT AT THIS EARLY TIME IT DOES NOT APPEAR TO BE A POTENT FLARE PRODUCING REGION.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. AT PRESS TIME, THE EXPECTED SHOCK FROM THE X1/HALO CME OF 27 APR HAD NOT ARRIVED. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT WERE PREDOMINANTLY HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BECOME DISTURBED ON 30 APR IN RESPONSE TO THE HALO CME OBSERVED ON 27 APR. THE CME MENTIONED ABOVE SHOULD IMPACT THE EARTH ON 01-02 MAY. THUS, ACTIVE TO MINOR STORM CONDITIONS ARE EXPECTED FOR THE NEXT THREE DAYS. ISOLATED PERIODS OF MAJOR STORMING ARE POSSIBLE DURING THIS INTERVAL.
III. Event Probabilities 30 APR to 02 MAY
Class M25%25%25%
Class X15%15%15%
Proton15%15%15%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       29 APR 101
  Predicted   30 APR-02 MAY  101/104/108
  90 Day Mean        29 APR 104
V. Geomagnetic A Indices
OBSERVED AFR/AP 28 APR  007/010
ESTIMATED AFR/AP 29 APR  006/005
PREDICTED AFR/AP 30 APR-02 MAY  020/020-020/020-018/018
VI. Geomagnetic Activity Probabilities 30 APR to 02 MAY
A. Middle Latitudes
Active30%30%30%
Minor storm30%30%30%
Major-severe storm15%15%15%
B. High Latitudes
Active30%30%30%
Minor storm40%40%40%
Major-severe storm15%15%15%

All times in UTC

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