Viewing archive of Friday, 2 July 1999

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 1999 Jul 02 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 183 Issued at 2200Z on 02 JUL 1999

IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z

SOLAR ACTIVITY RETURNED TO MODERATE LEVELS. REGION 8598 (N23W80) CONTINUED TO SLOWLY DECAY AS IT NEARED THE WEST LIMB, BUT WAS ABLE TO PRODUCE AN IMPULSIVE M1/1F FLARE AT 01/2143Z ASSOCIATED WITH MINOR RADIO EMISSION. REGION 8603 (S14W37) DISPLAYED LITTLE CHANGE AND REMAINED MODERATE IN SIZE AND MAGNETIC COMPLEXITY. IT PRODUCED AN M1/1N FLARE AT 01/2331Z AND A FEW SUBFLARES, NONE OF WHICH WERE ASSOCIATED WITH SIGNIFICANT RADIO EMISSION. REGION 8611 (S25W06) RETAINED MODERATE MAGNETIC COMPLEXITY AND WAS THE LARGEST (APPROX. AREA 400 MILLIONTHS) AND MOST ACTIVE OF THE VISIBLE REGIONS. IT PRODUCED TWO M-CLASS FLARES: AN M2/1B AT 02/0138Z AND AN M1/SF 02/1520Z, BOTH OF WHICH WERE ACCOMPANIED BY MINOR RADIO EMISSION. NEW REGIONS 8616 (N30W73) AND 8617 (N14W28) WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN MODERATE WITH A GOOD CHANCE FOR ISOLATED, LOW-LEVEL M-CLASS FLARES.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
GEOMAGNETIC FIELD ACTIVITY RANGED FROM QUIET TO MINOR STORM LEVELS. THE ACE SPACECRAFT DETECTED AN INTERPLANETARY SHOCK PASSAGE AT L1 AT 02/0024Z FOLLOWED BY A SUDDEN IMPULSE AT EARTH AT 02/0101Z (48 NT, AS MEASURED BY THE BOULDER USGS MAGNETOMETER). UNSETTLED TO ACTIVE LEVELS OCCURRED DURING THE REMAINDER OF THE PERIOD WITH A BRIEF INCREASE TO MINOR STORM LEVELS DURING THE 02/1500-1800Z INTERVAL. THE SOURCE OF THIS ACTIVITY WAS LIKELY A HALO-CME OBSERVED ON 30 JUNE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE AT QUIET TO ACTIVE LEVELS DURING THE FIRST DAY, THEN DECREASE TO QUIET TO UNSETTLED LEVELS FOR THE BALANCE OF THE PERIOD.
III. Event Probabilities 03 JUL to 05 JUL
Class M60%60%60%
Class X10%10%10%
Proton10%10%10%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       02 JUL 187
  Predicted   03 JUL-05 JUL  180/175/165
  90 Day Mean        02 JUL 148
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 JUL  006/009
ESTIMATED AFR/AP 02 JUL  022/024
PREDICTED AFR/AP 03 JUL-05 JUL  012/015-008/012-008/012
VI. Geomagnetic Activity Probabilities 03 JUL to 05 JUL
A. Middle Latitudes
Active20%15%15%
Minor storm10%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active25%20%20%
Minor storm15%10%10%
Major-severe storm01%01%01%

All times in UTC

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