Viewing archive of Thursday, 29 April 2010

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 2010 Apr 29 2201 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 119 Issued at 2200Z on 29 Apr 2010

IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z

Solar activity was very low. Region 1063 (N16E01) is spotless today. No flares were observed during the past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
The geomagnetic field was predominantly quiet with an isolated active period at mid-latitude reported at 29/0600Z. Observations from the ACE spacecraft indicate the activity was due to a co-rotating interaction region with observed IMF Bz fluctuations of +/- 7 nT and an increase in Bt of 9 nT. Solar wind speeds have increased the last 24 hours from around 310 to 400 km/s indicating the presence of a weak coronal hole high speed stream.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be predominantly quiet for the next three days (30 April-02 May).
III. Event Probabilities 30 Apr to 02 May
Class M01%01%01%
Class X01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       29 Apr 076
  Predicted   30 Apr-02 May  076/076/076
  90 Day Mean        29 Apr 081
V. Geomagnetic A Indices
  Observed Afr/Ap 28 Apr  002/004
  Estimated     Afr/Ap 29 Apr  005/005
  Predicted    Afr/Ap 30 Apr-02 May  005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 30 Apr to 02 May
A. Middle Latitudes
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Minor storm01%01%01%
Major-severe storm01%01%01%

All times in UTC

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