Solar Activity Report for 9/22/03
- The Earth is now exiting a high speed solar wind stream, and
geomagnetic activity is subsiding after several days of on and off
geomagnetic storms. The elevated geomagnetic activity produced some
quite beautiful aurora dislays, as can be seen here :
The geomagnetic field will remain generally unsettled over the next
couple of days, and a brief GF-1 geomagnetic storm is at least an
outside possibility. There are three sunspot regions visible tonight
on the face of the sun. Of them, region 464 is easily the largest,
spanning almost 10 Earth-diameters end to end. It doesn't have a very
complex magnetic field, so a major flare isn't likely for the time
being. However, a low-level M-class isn't completely out of the question.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 91
SFI : 123
A index : 17
K index : 2
Solar wind speed : 489.2 km/sec
Solar wind density : 2.7 protons/cc
Solar wind pressure : 0.9 nPa
IMF : 5.9 nT
IMF Orientation : 2.5 nT North
Conditions for the last 24 hours :
No space weather storms were observed for the past 24 hours.
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 low. There continues to be, however,
a slight chance for an isolated M-class flare from Region 464.
Geomagnetic activity forecast :
The geomagnetic field is expected to be unsettled to active for the
next two days. Conditions should be predominantly unsettled by the
third day as the high speed wind stream is expected to be
significantly reduced by that time.
Recent significant solar flare activity :