Solar Activity Report for 9/11/02
- Today's solar activity report is dedicated to the men, women, and
children who lost their lives in the terrorist attacks of September
** Aurora Watch In Effect **
Early Wednesday morning, the Earth entered a high-speed coronal hole
generated solar wind stream, which persists tonight. The
Interplanetary Magnetic Field swung south, and a G-2 class geomagnetic
storm was the result. Aurora were spotted over northern Europe and
the northern US. While that geomagnetic storm has since subsided,
more activity is possible as long as the the Earth is inside the
high-speed solar wind stream. On the sunspot front, sunspot region
105 has become very well developed, and spans 17 Earth diameters from
end to end. It has been active, generating 4 M-class flares in as
many days. It is a possibility that a major will erupt from this
sunspot region in the days ahead.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 216
SFI : 213
A index : 23
K index : 3
Solar wind speed : 514.0 km/sec
Solar wind density : 1.7 protons/cc
Solar wind pressure : 0.7 nPa
IMF : 6.7 nT
IMF Orientation : 5.8 nT North
Conditions for the last 24 hours :
Space weather for the past 24 hours has been moderate. Geomagnetic
storms reaching the G2 level occurred. Radio blackouts reaching the R1
Forecast for the next 24 hours :
Space weather for the next 24 hours is expected to be minor.
Geomagnetic storms reaching the G1 level are expected. Radio blackouts
reaching the R1 level are expected.
Solar activity forecast :
Solar activity is expected to be at moderate levels for the next three
days. Region 105 is a likely source of further M-class activity.
Regions 103 and 107 may become more active during the period and could
produce M-class flares as well.
Geomagnetic activity forecast :
The geomagnetic field is expected to be mainly unsettled to active for
the next 24-48 hours. Isolated minor storm conditions may also occur,
especially at higher latitudes. Conditions are expected to be in the
quiet to unsettled range by the end of the forecast period.
Recent significant solar flare activity :
11-Sep-2002 0735Z M2.2
10-Sep-2002 1456Z M2.9
09-Sep-2002 1752Z M2.1