Viewing archive of Monday, 1 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 01 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 060 Issued at 2200Z on 01 MAR 1999

IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 01-2100Z

SOLAR ACTIVITY RETURNED TO LOW LEVELS. REGION 8471 (N28W26) PRODUCED SEVERAL LOW LEVEL C-CLASS SUBFLARES. ON 28 FEB, PRIOR TO THE M6/2B, THIS REGION DEVELOPED A DELTA MAGNETIC CLASSIFICATION OF MODERATE STRENGTH. IN THE INTERIM, THIS DELTA FADED AND OVERALL THE REGION DECAYED SLIGHTLY IN PENUMBRAL COVERAGE. THE MAIN NEUTRAL LINE IN THIS REGION WAS ALMOST LINEAR SUGGESTING MAGNETIC SHEAR AT THAT LOCATION, BUT VECTOR MAGNETOGRAPH DATA WERE NOT AVAILABLE TO CONFIRM THIS SUPPOSITION. REGION 8475 (N32E16) EXHIBITED GROWTH AND PRODUCED SEVERAL SUBFLARES. A DELTA MAGNETIC CONFIGURATION MAY BE FORMING IN THIS REGION. TWO SMALL AREAS OF PLAGE AND SPOTS EMERGED NEAR S15W07. THERE WERE NUMBERED AS NEW REGION 8478. THIS AREA MAY BE SPLIT INTO TWO SEPARATE REGIONS IN THE NEAR FUTURE.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BECOME LOW TO MODERATE. REGION 8471 REMAINS CAPABLE OF PRODUCING AN ISOLATED M-CLASS EVENT BUT FLARE FREQUENCY SHOULD DECREASE AS DECAY CONTINUES. REGION 8475 SHOULD BEGIN TO PRODUCE FREQUENT C-CLASS EVENTS AND ISOLATED M-CLASS EVENTS SHOULD GROWTH AND INCREASING MAGNETIC COMPLEXITY CONTINUE.
IIA. Geophysical Activity Summary 28-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD RANGED FROM UNSETTLED TO MINOR STORM LEVELS. THE MOST DISTURBED PERIODS WERE 01/0000-0600Z AND 01/1200-1800Z. SOLAR WIND DATA SHOWED A LOW SPEED, HIGH DENSITY FLOW WITH NORTHWARD BZ DURING THE DISTURBANCE. IT IS POSSIBLE THIS DISTURBANCE WAS RELATED TO A FILAMENT DISRUPTION IN THE SOUTHEAST QUADRANT ON 24-25 FEB. AT THE END OF THE PERIOD, SOLAR WIND VELOCITY WAS INCREASING AND DENSITY WAS DECREASING.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE PREDOMINANTLY QUIET TO UNSETTLED FOR THE NEXT THREE DAYS. ISOLATED ACTIVE CONDITIONS ARE POSSIBLE DURING THAT TIME. A SMALL CORONAL HOLE SHOULD BEGIN TO AFFECT THE EARTH'S FIELD ON 02-03 MAR.
III. Event Probabilities 02 MAR to 04 MAR
Class M50%40%40%
Class X10%10%10%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       01 MAR 120
  Predicted   02 MAR-04 MAR  120/120/118
  90 Day Mean        01 MAR 144
V. Geomagnetic A Indices
OBSERVED AFR/AP 28 FEB  010/014
ESTIMATED AFR/AP 01 MAR  024/025
PREDICTED AFR/AP 02 MAR-04 MAR  015/015-012/012-012/010
VI. Geomagnetic Activity Probabilities 02 MAR to 04 MAR
A. Middle Latitudes
Active20%20%20%
Minor storm10%10%10%
Major-severe storm05%05%05%
B. High Latitudes
Active25%20%20%
Minor storm10%10%10%
Major-severe storm05%05%05%

All times in UTC

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