Viewing archive of Thursday, 4 March 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 Mar 04 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 063 Issued at 2200Z on 04 MAR 1999

IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z

SOLAR ACTIVITY REMAINED LOW. REGION 8475 (N32W22) PRODUCED A C3/1F AT 03/2343Z AND A C3/SF AT 04/0514Z. REGION 8475 EXHIBITED SLIGHT DECAY. REGION 8476 (N18W34) GREW SLIGHTLY DURING THE PERIOD. HOWEVER, ITS RATE OF EMERGENCE SLOWED. REGION 8471 (N28W63) WAS GENERALLY STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE PREDOMINANTLY LOW FOR THE NEXT THREE DAYS. REGIONS 8471, 8475, AND 8476 ARE CAPABLE OF PRODUCING C-CLASS EVENTS. THEY ALSO COULD PRODUCE AN ISOLATED M-CLASS EVENT BUT THAT POSSIBILITY IS DECREASING. PREVIOUSLY ACTIVE LONGITUDES ARE DUE TO RETURN TO THE EAST LIMB NEAR THE END OF THE PERIOD. ACTIVITY LEVELS MAY ELEVATE AT THAT TIME. AN ACCURATE ESTIMATE OF THE FLARE POTENTIAL OF THESE LONGITUDES MUST AWAIT THEIR APPEARANCE AT THE LIMB.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM LEVELS. AFTER SOLAR WIND VELOCITIES DECREASED ON 03 MAR TO LESS THAN 400 KM/S, THEY BEGAN TO INCREASE AGAIN EARLY ON 04 MAR TO OVER 550 KM/S. DENSITY REMAINED LOW INDICATING A RESURGENCE OF A CORONAL HOLE STREAM IMPACTING THE EARTH. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS REACHED HIGH LEVELS AT 04/1920Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE AT PREDOMINANTLY UNSETTLED TO ACTIVE LEVELS FOR THE NEXT THREE DAYS. ISOLATED MINOR STORMING IS POSSIBLE DURING THAT TIME. THIS FORECAST IS BASED UPON THE CONTINUATION OF A CORONAL HOLE STREAM IMPACTING THE EARTH FROM AN ELONGATED CORONAL HOLE IN THE SOUTHWEST QUADRANT OF THE SUN. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT SHOULD REACH HIGH LEVELS EACH DAY OF THE FORECAST PERIOD.
III. Event Probabilities 05 MAR to 07 MAR
Class M25%25%35%
Class X05%05%05%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       04 MAR 144
  Predicted   05 MAR-07 MAR  150/158/165
  90 Day Mean        04 MAR 143
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 MAR  011/015
ESTIMATED AFR/AP 04 MAR  020/020
PREDICTED AFR/AP 05 MAR-07 MAR  018/018-015/015-009/009
VI. Geomagnetic Activity Probabilities 05 MAR to 07 MAR
A. Middle Latitudes
Active30%30%20%
Minor storm15%15%10%
Major-severe storm05%05%05%
B. High Latitudes
Active35%30%20%
Minor storm20%15%10%
Major-severe storm05%05%05%

All times in UTC

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