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OK0NAG > SOLAR 12.04.10 08:37l 251 Lines 7832 Bytes #999 (0) @ EU
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Subj: Report of Solar Geophysical Activity (RSGA)
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Date: 11 Apr 2010 22:05:05 +0000
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Subject: Report of Solar Geophysical Activity (RSGA)
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:Product: Report of Solar-Geophysical Activity
:Issued: 2010 Apr 11 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 101 Issued at 2200Z on 11 Apr 2010
IA. Analysis of Solar Active Regions and Activity from 10/2100Z
to 11/2100Z: Solar activity was very low. No flares occurred during
the past 24 hours. The solar disk was generally void of spots,
although there was some evidence late in the period for emerging
flux and possible new spot formation near S18E07.
IB. Solar Activity Forecast: Solar activity is expected to be very
low for the next three days (12-14 April).
IIA. Geophysical Activity Summary 10/2100Z to 11/2100Z:
The geomagnetic field was initially quiet but became unsettled at
mid-latitudes and active with some isolated storm periods at high
latitudes after a sudden impulse at 1305Z (5 nT in Boulder). The
sudden impulse followed observation of a weak shock at the ACE
spacecraft at 1215Z; velocity jumped from 380 km/s to about 450
km/s, and the total magnetic field increased from 4 nT to about 10
nT. The shock was followed by moderately enhanced southward field Bz
with values ranging between -3 nT to -8 nT. The shock was most
likely a result of the halo CME that was observed on 08 April. The
greater than 2 MeV electron flux at geosynchronous orbit reached
very high levels.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be quiet with some unsettled periods for the first day
(12 April) as the current disturbance subsides. Activity is expected
to be quiet for the second and third days (13-14 April).
III. Event Probabilities 12 Apr-14 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green
IV. Penticton 10.7 cm Flux
Observed 11 Apr 075
Predicted 12 Apr-14 Apr 075/075/075
90 Day Mean 11 Apr 083
V. Geomagnetic A Indices
Observed Afr/Ap 10 Apr 003/003
Estimated Afr/Ap 11 Apr 007/010
Predicted Afr/Ap 12 Apr-14 Apr 007/007-005/005-005/005
VI. Geomagnetic Activity Probabilities 12 Apr-14 Apr
A. Middle Latitudes
Active 20/10/10
Minor storm 05/01/01
Major-severe storm 01/01/01
B. High Latitudes
Active 25/20/20
Minor storm 15/10/10
Major-severe storm 05/01/01
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. Please do not use the from
address for correspondence, as it is not monitored. For comments or help,
please contact us: pss.help@noaa.gov.
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