Viewing archive of Tuesday, 24 July 2001

Solar activity report

Report of Solar-Geophysical Activity 2001 Jul 24 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 205 Issued at 2200Z on 24 Jul 2001

IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z

Solar activity remained low. Region 9543 (S23W44) produced isolated B- and C-class subflares as it continued to gradually increase in area. It remained moderate-sized with a minor degree of magnetic complexity. The remaining regions were mostly small, stable, and simply structured. New Regions 9554 (N16W61) and 9555 (S08E54) were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be low. There will be a slight chance for an isolated M-class flare from Region 9543.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
Geomagnetic field activity ranged from quiet to active levels. Active levels occurred during 24/1200 - 1500 UTC.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is expected to be at quiet to active levels during 25 - 26 July. Activity is expected to decrease to quiet to unsettled levels on 27 July.
III. Event Probabilities 25 Jul to 27 Jul
Class M25%25%25%
Class X01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       24 Jul 133
  Predicted   25 Jul-27 Jul  135/135/130
  90 Day Mean        24 Jul 156
V. Geomagnetic A Indices
  Observed Afr/Ap 23 Jul  008/012
  Estimated     Afr/Ap 24 Jul  015/015
  Predicted    Afr/Ap 25 Jul-27 Jul  012/015-012/015-010/012
VI. Geomagnetic Activity Probabilities 25 Jul to 27 Jul
A. Middle Latitudes
Minor storm15%15%10%
Major-severe storm05%05%01%
B. High Latitudes
Minor storm20%20%15%
Major-severe storm05%05%05%

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