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OK0NAG > SOLAR 27.04.08 00:17l 81 Lines 3363 Bytes #999 (0) @ EU
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Subj: Report of Solar Geophysical Activity (RSGA)
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Date: Sat, 26 Apr 2008 22:01:41 -0000
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Subject: Report of Solar Geophysical Activity (RSGA)
X-asg-orig-subj: Report of Solar Geophysical Activity (RSGA)
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:Product: Report of Solar-Geophysical Activity
:Issued: 2008 Apr 26 2200 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Weather Prediction Center and the U.S. Air Force.
#
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 117 Issued at 2200Z on 26 Apr 2008
IA. Analysis of Solar Active Regions and Activity from 25/2100Z
to 26/2100Z: Solar activity was very low. The solar disk is void of
spots. Nonetheless there was a B3/Sf flare at 1408Z from an
unnumbered area of spotless plage near N08E09. The flare was
associated with a wave that was visible in EUV imagery on STEREO and
SOHO, type II and type IV radio sweeps, as well as a slow, faint,
full halo CME visible in coronagraph imagery. The estimated plane of
sky speed for the CME was around 430-480 km/s.
IB. Solar Activity Forecast: Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z:
The geomagnetic field was quiet to unsettled during the past 24
hours. Solar wind speed remains somewhat elevated (around 460-500
km/s) and density very low (around 1 p/cc), consistent with the
decaying phase of a high speed stream. The greater than 2 MeV
electron flux at geosynchronous orbit was high during the past 24
hours.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be predominantly quiet for the next two days (27-28
April). A small increase is expected late on the third day (29
April) in response to today's CME event: activity is expected to be
unsettled with a chance for isolated active periods after the
disturbance arrives.
III. Event Probabilities 27 Apr-29 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF Green
IV. Penticton 10.7 cm Flux
Observed 26 Apr 069
Predicted 27 Apr-29 Apr 070/070/070
90 Day Mean 26 Apr 071
V. Geomagnetic A Indices
Observed Afr/Ap 25 Apr 007/008
Estimated Afr/Ap 26 Apr 007/008
Predicted Afr/Ap 27 Apr-29 Apr 005/005-005/005-007/008
VI. Geomagnetic Activity Probabilities 27 Apr-29 Apr
A. Middle Latitudes
Active 10/10/20
Minor storm 05/05/10
Major-severe storm 01/01/01
B. High Latitudes
Active 10/10/25
Minor storm 05/05/10
Major-severe storm 01/01/05
Thank you for using the Product Subscription Service. If you would like
to remove a product subscription or update the personal information in
your account, go to: https://pss.swpc.noaa.gov. For problems, contact:
mailto:pss.help@noaa.gov.
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