Product: Geophysical Alert Message wwv.txt
Issued: 2005 Sep 06 2106 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Environment Center
# Geophysical Alert Message
Solar-terrestrial indices for 06 September follow.
Solar flux 83 and estimated mid-latitude A-Index 11.
The mid-latitude K-index at 2100 UTC on 06 September was 3 (33 nT).
Space weather for the past 24 hours has been minor.
Radio blackouts reaching the R1 level occurred.
Space weather for the next 24 hours is expected to be minor.
Radio blackouts reaching the R1 level are expected.
Level R1 - Radio Blackout
HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
2005/09/06 19:20:00 M1.4
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 249 Issued at 2200Z on 06 Sep 2005
IA. Analysis of Solar Active Regions and Activity from 05/2100Z
to 06/2100Z: Solar activity levels increased to moderate this
period. A long duration M1 flare and an associated CME was in
progress on the southeast limb at the time of this issue. The likely
source of this event is old active Region 798 (S09, L=217), which is
expected to rotate into view on 07 Sep. Old Region 798 was
responsible for significant flare activity during its last transit
across the visible disk, and was the likely source of several
farside CMEs during the past two weeks. Region 805 (S12W59), the
only active region with sunspots on the visible disk, remained quiet
IB. Solar Activity Forecast: Solar activity is expected to be
moderate to high. Old Region 798 is rotating onto the visible disk
near S09, and is expected to significantly increase solar activity
IIA. Geophysical Activity Summary 05/2100Z to 06/2100Z:
The geomagnetic field was quiet to unsettled. The greater than 2 MeV
electron flux at geosynchronous orbit was at high levels again
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to remain at quiet to unsettled levels on 07 and 08 Sep.
Isolated active periods are possible on 09 Sep due to a high speed
coronal hole stream.
[edit on 6-9-2005 by Regenmacher]