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

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 120 Issued at 2200Z on 30 APR 1998

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

SOLAR ACTIVITY WAS VERY LOW. REGION 8210 (S16E03) PRODUCED ONLY MINOR FLUCTUATIONS. THIS REGION MAINTAINED SOME MIXED POLARITIES AND OVERALL WAS STABLE. THE TYPE IV RADIO BURST ASSOCIATED WITH THE M6/3B FLARE ON 29 APR REMAINED IN PROGRESS THROUGH THE LAST 24 HOURS.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE GENERALLY LOW WITH OCCASIONAL C-CLASS FLARES FROM REGION 8210. AN ISOLATED M-CLASS EVENT IS POSSIBLE. THIS REGION COULD PRODUCE ANOTHER X-CLASS EVENT BEFORE WEST LIMB TRANSIT BUT THAT POSSIBILITY IS BECOMING LESSENED AS THE REGION SIMPLIFIES MAGNETICALLY.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
THE GEOMAGNETIC FIELD WAS QUIET UNTIL A 31 NT SUDDEN IMPULSE WAS OBSERVED AT 30/0933Z. THIS WAS PRECEDED BY A SHOCK PASSAGE AT THE ACE SPACECRAFT AT 30/0845Z. AFTER THE SUDDEN IMPULSE, UNSETTLED TO ACTIVE CONDITIONS WERE OBSERVED. THIS DISTURBANCE IS BELIEVED TO BE RELATED TO THE X1/HALO CME OBSERVED ON 27 APR. A WEAK ENERGETIC PROTON (GT 10 MEV) ENHANCEMENT BEGAN AT 30/0405Z. MAXIMUM FLUX WAS 2 PFU. THIS ENHANCEMENT IS ATTRIBUTED TO THE M6/HALO CME OBSERVED ON 29 APR. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT WERE PREDOMINANTLY HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE UNSETTLED TO ACTIVE FOR 01 MAY. ISOLATED MINOR STORMING IS POSSIBLE DURING THAT TIME. A LARGER DISTURBANCE IS FORECAST FOR 02-03 MAY AS A RESULT OF M6/HALO CME OBSERVED YESTERDAY. ACTIVE TO MINOR STORM LEVELS ARE EXPECTED WITH PERIODS AT MAJOR STORM POSSIBLE. THE CURRENT PROTON ENHANCEMENT SHOULD DECAY TO BACKGROUND LEVELS IN THE NEXT TWO DAYS.
III. Event Probabilities 01 MAY to 03 MAY
Class M25%25%25%
Class X10%10%10%
Proton10%10%10%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       30 APR 103
  Predicted   01 MAY-03 MAY  104/106/108
  90 Day Mean        30 APR 104
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 APR  005/006
ESTIMATED AFR/AP 30 APR  012/012
PREDICTED AFR/AP 01 MAY-03 MAY  020/018-030/030-015/015
VI. Geomagnetic Activity Probabilities 01 MAY to 03 MAY
A. Middle Latitudes
Active30%20%30%
Minor storm30%40%15%
Major-severe storm15%20%05%
B. High Latitudes
Active30%20%30%
Minor storm40%45%15%
Major-severe storm15%20%05%

All times in UTC

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