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OK0NAG > SOLAR 28.04.12 23:04l 268 Lines 8922 Bytes #999 (0) @ EU
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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: 2012 Apr 28 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 119 Issued at 2200Z on 28 Apr 2012
IA. Analysis of Solar Active Regions and Activity from 27/2100Z
to 28/2100Z: Solar activity was at low levels due to single,
low-level C-class events from Regions 1461 (N10W89), 1466 (N12W51),
1467 (N12E18), 1469 (S19E14) and new Region 1470 (S17E61). New
Region 1471 (S23E70) was also numbered during the period. A 16
degree filament eruption was observed in SDO/AIA 304 imagery at
28/1045Z. During the period of the eruption, the SE to NW oriented
filament was centered near S32W33. LASCO/C2 imagery observed an
associated slow-moving, non-Earth directed CME lifting off the SW
limb at 28/1224Z.
IB. Solar Activity Forecast: Solar activity is expected to be low
with a slight chance for M-class activity for the next three days
(29 April - 01 May).
IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z:
The geomagnetic field was at quiet to unsettled levels with an
isolated high latitude active period between 28/0900 - 1200Z.
Through the period, ACE solar wind velocities steadily decreased
from about 490 km/s to near 420km/s while the Bz component of the
interplanetary magnetic field was variable between +/-4 nT. The
greater than 2 MeV electron flux at geosynchronous orbit was at high
levels throughout the period.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be at predominately quiet levels for days one and two
(29 - 30 April). By day three (01 May), quiet to unsettled levels,
with isolated active periods, are expected as a coronal hole high
speed stream moves into a geoeffective position.
III. Event Probabilities 29 Apr-01 May
Class M 20/20/20
Class X 01/01/01
Proton 01/01/01
PCAF green
IV. Penticton 10.7 cm Flux
Observed 28 Apr 121
Predicted 29 Apr-01 May 125/120/120
90 Day Mean 28 Apr 112
V. Geomagnetic A Indices
Observed Afr/Ap 27 Apr 007/008
Estimated Afr/Ap 28 Apr 005/005
Predicted Afr/Ap 29 Apr-01 May 004/005-004/005-007/008
VI. Geomagnetic Activity Probabilities 29 Apr-01 May
A. Middle Latitudes
Active 10/10/15
Minor storm 01/01/05
Major-severe storm 01/01/01
B. High Latitudes
Active 10/10/20
Minor storm 01/01/05
Major-severe storm 01/01/01
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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