Solar Actrivity Report for 9/11/03
- The Earth remains inside of a high speed coronal hole solar wind
stream tonight. The solar wind speed is beginning to drop off,
although it is still well over 500 km/sec. It had peaked at just over
700 km/sec within the last two days, and G-1 geomagnetic storm
conditions have been observed within the last 24 hours. While the
geomagnetic activity has generally been subdued with this encounter,
it was enough to trigger some aurora that were seen in northern Canada
and Alaska, as can be seen here :
The solar wind speed should continue to decline over the next day.
There are a pair of sunspot regions visible. Sunspot region 456 looks
as if it has at least an outside chance of producing a low level
M-class flare. The background X-ray flux has been slowly rising over
the last 48 hours, indicating that region 456 is becoming a little
The current solar and geomagnetic conditions are :
NOAA sunspot number : 55
SFI : 97
A index : 18
K index : 3
Solar wind speed : 567.1 km/sec
Solar wind density : 2.1 protons/cc
Solar wind pressure : 1.0 nPa
IMF : 5.7 nT
IMF Orientation : 2.1 nT South
Conditions for the last 24 hours :
Space weather for the past 24 hours has been minor. Geomagnetic storms
reaching the G1 level occurred.
Forecast for the next 24 hours :
No space weather storms are expected for the next 24 hours.
Solar activity forecast :
Solar activity is expected to be at very low to low levels. Region 456
has the potential for C-class flares.
Geomagnetic activity forecast :
The geomagnetic field is expected to be at quiet to active levels.
High speed stream effects are expected to continue into day one with
unsettled to active conditions. Quiet to unsettled conditions are
expected on day two and day three of the forecast period.
Recent significant solar flare activity :