Solar Activity Report for 9/9/03
- The Earth has entered a high speed coronal hole solar wind stream, and
the solar wind speed has topped the 600 km/sec mark. So far, there
hasn't been much in the way of geomagnetic activity, as the
Interplanetary Magnetic Field has stayed either north-pointing or
close to neutral. This continues the trend that prevailed during the
last coronal hole encounter. It could change at any time, however, so
stay tuned. There were two impressive CME's that erupted off of the
southwestern limb of the solar disk on the 7th and 8th. We might get
a glancing blow from them sometime on Wednesday. If that happens,
activity could pick up. Only a single sunspot region is visible this
evening, and it doesn't appear to have the potential for producing a
significant flare at this time.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 43
SFI : 96
A index : 22
K index : 4
Solar wind speed : 609.4 km/sec
Solar wind density : 2.8 protons/cc
Solar wind pressure : 1.5 nPa
IMF : 7.8 nT
IMF Orientation : 0.5 nT South
Conditions for the last 24 hours :
No space weather storms were observed for the past 24 hours.
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.
Solar activity forecast :
Solar activity is expected to remain at very low levels.
Geomagnetic activity forecast :
The geomagnetic field is expected to be at unsettled to active levels
through day one of the forecast period due to a favorably positioned
coronal hole. Activity on day one may be further enhanced due to a
possible transient passage resulting from the C5 flare activity seen
on 7 September. Days two and three should see a return to
predominantly unsettled conditions as the recurrent coronal hole wanes.
Recent significant solar flare activity :