Solar Activity Report for 9/7/03
- The solar wind speed has slowed down as the Earth has exited the most
recent high speed solar wind stream, and what little geomagnetic
activity there was has stopped. Things are pretty quiet this evening.
However, there will be some more activity coming soon. Continuing
what seems to be almost a constant parade of coronal holes, another
one has rotated into an Earth-pointing position. We should see the
high speed solar wind from that one arrive on the 9th or 10th. What,
if any, geomagnetic activity we see will depend, as it did this most
recent time, on what the Interplanetary Magnetic Field does. There
are no significant flares to report, and none of the three numbered
sunspot groups visible look to have the potential for generating much
in the way of flares at this time. There was, however, a nice CME off
of the southwestern limb of the solar disk earlier today that was
associated with long-duration C-class flare. The space weather folks
are saying we might get a bit of a glancing blow from it. Stay tuned.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 54
SFI : 108
A index : 7
K index : 1
Solar wind speed : 405.3 km/sec
Solar wind density : 1.8 protons/cc
Solar wind pressure : 0.5 nPa
IMF : 4.8 nT
IMF Orientation : 0.2 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 to very low. The current X-ray
flux levels are elevated following today's eruption, but are expected
to return to the pre-flare background level early in the period. Very
isolated low C-class flares are possible.
Geomnagnetic activity forecast :
The geomagnetic field is expected to continue at quiet to unsettled
levels through day one. A recurring high speed coronal hole stream
will likely produce active to minor storm periods on days two and
three. Activity on day three may be further enhanced by transient
material from today's CME off the SW limb.
Recent significant solar flare activity :