Viewing archive of Friday, 25 May 2001

Solar activity report

Report of Solar-Geophysical Activity 2001 May 25 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 145 Issued at 2200Z on 25 May 2001

IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z

Solar activity was low. The largest flare of the past day was a C5 at 25/1937 UTC which occurred in conjunction with optical flares in Regions 9463 (N08W23) and 9468 (N07E12). Both of these sunspot groups were responsible for other, smaller x-ray flares as well. Other disk regions were relatively quiet.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate. Additional C-class flares are likely and an isolated M-class flare is possible. Regions 9463 and 9468 are the most probable sources of activity.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field ranged from quiet to active levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to unsettled.
III. Event Probabilities 26 May to 28 May
Class M30%30%30%
Class X01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       25 May 162
  Predicted   26 May-28 May  160/160/155
  90 Day Mean        25 May 168
V. Geomagnetic A Indices
  Observed Afr/Ap 24 May  007/009
  Estimated     Afr/Ap 25 May  008/008
  Predicted    Afr/Ap 26 May-28 May  008/008-015/015-010/018
VI. Geomagnetic Activity Probabilities 26 May to 28 May
A. Middle Latitudes
Minor storm01%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Minor storm05%05%05%
Major-severe storm01%02%02%

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