Viewing archive of Monday, 23 November 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 Nov 23 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 327 Issued at 2200Z on 23 NOV 1998

IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z

SOLAR ACTIVITY REMAINED AT HIGH LEVELS. REGION 8384 (S26W101) PRODUCED ANOTHER MAJOR FLARE AS IT CONTINUED TO ROTATE BEYOND THE WEST LIMB. THE FLARE WAS AN X2/SF AT 23/0644UT WITH AN ASSOCIATED SIGNIFICANT TYPE IV RADIO SWEEP, A LOOP PROMINENCE SYSTEM, AND MODERATE DISCRETE FREQUENCY RADIO EMISSION. OPTICALLY UNCORRELATED, LOW-LEVEL M-CLASS X-RAY FLARES WERE DETECTED AT 22/2215UT AND 23/1121UT. A SPRAY REACHING 0.3 SOLAR RADII WAS SEEN ON THE NORTHEAST LIMB NEAR N20 AND WAS LIKELY ASSOCIATED WITH THE RETURN OF OLD REGION 8375 (N19, L = 185). A 200 SFU TENFLARE WAS DETECTED DURING THE SPRAY. NEW REGION 8393 (S18E71) WAS NUMBERED TODAY AS A SMALL D-TYPE. IT IS THE RETURN OF OLD REGION 8379, WHICH DID NOT PRODUCE SIGNIFICANT ACTIVITY DURING ITS LAST ROTATION. NO SIGNIFICANT GROWTH OR DECAY WAS NOTED IN THE REMAINING REGIONS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. M-CLASS FLARE PROBABILITIES MAY INCREASE UPON THE RETURN OF OLD REGION 8375, WHICH PRODUCED A MAJOR FLARE AND A SOLAR PROTON EVENT DURING ITS LAST ROTATION. THERE IS STILL A SMALL, BUT DIMINISHING CHANCE FOR AN ISOLATED M-CLASS FLARE FROM BEYOND THE SOUTHWEST LIMB.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS. THE PROTON FLUX ENHANCEMENT AT GT 10 MEV (THAT FOLLOWED YESTERDAY'S X3/1N FLARE) DECLINED TO BACKGROUND LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE AT UNSETTLED TO ACTIVE LEVELS DURING THE FIRST TWO DAYS, THEN DECLINE TO UNSETTLED LEVELS ON DAY THREE. THE GT 2 MEV ELECTRON FLUX MAY RISE TO HIGH LEVELS DURING THE LATTER HALF OF THE FORECAST PERIOD.
III. Event Probabilities 24 NOV to 26 NOV
Class M40%30%30%
Class X10%01%01%
Proton10%01%01%
PCAFYELLOW
IV. Penticton 10.7 cm Flux
  Observed       23 NOV 130
  Predicted   24 NOV-26 NOV  125/125/125
  90 Day Mean        23 NOV 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 NOV  006/007
ESTIMATED AFR/AP 23 NOV  010/009
PREDICTED AFR/AP 24 NOV-26 NOV  015/015-015/015-010/010
VI. Geomagnetic Activity Probabilities 24 NOV to 26 NOV
A. Middle Latitudes
Active30%30%20%
Minor storm10%10%05%
Major-severe storm01%01%01%
B. High Latitudes
Active40%40%20%
Minor storm10%10%05%
Major-severe storm01%01%01%

All times in UTC

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G2 - Moderate geomagnetic storm

Observed Kp: 6
Threshold reached: 19:52 UTC

Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Oulu, Rovaniemi
Arkhangelsk
Luleå
The solar wind speed is currently moderately high (563.4 km/sec.)
The strength of the interplanetary magnetic field is moderate (18.92nT), the direction is moderately South (-15.36nT).

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