Viewing archive of Friday, 27 July 2001

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 2001 Jul 27 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 208 Issued at 2200Z on 27 Jul 2001

IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z

Solar activity increased to low levels. Region 9543 (S25W82) produced an isolated C-class subflare. This region remained moderate-sized with a slight degree of magnetic complexity as it began to cross the west limb. The remaining regions were unremarkable. New Region 9559 (S25E14) was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be at very low to low levels.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
Geomagnetic field activity was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels late in the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is expected to be at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit is expected to decrease to normal to moderate levels early in the period.
III. Event Probabilities 28 Jul to 30 Jul
Class M20%20%20%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       27 Jul 121
  Predicted   28 Jul-30 Jul  120/120/120
  90 Day Mean        27 Jul 153
V. Geomagnetic A Indices
  Observed Afr/Ap 26 Jul  011/014
  Estimated     Afr/Ap 27 Jul  008/009
  Predicted    Afr/Ap 28 Jul-30 Jul  008/008-008/008-012/012
VI. Geomagnetic Activity Probabilities 28 Jul to 30 Jul
A. Middle Latitudes
Active20%20%25%
Minor storm10%10%10%
Major-severe storm01%01%01%
B. High Latitudes
Active25%25%30%
Minor storm15%15%15%
Major-severe storm01%01%01%

All times in UTC

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