Solar Activity Report for 9/18/03
- View Source** Aurora Watch In Effect **
Geomagnetic storm conditions were observed again today as the Earth
remains inside of a high speed solar wind stream. At one time, the
solar wind speed exceeded 800 km/sec. It has slowed down a bit, but
is still over 700 km/sec. Aurora have been seen from several
locations in the northern US, Canada, and Alaska over the last two
nights, and more are possible tonight. The elevated solar wind speeds
are expected to persist for at least the next two days, and more
geomagnetic storms conditions are a distinct possibility. None of the
four numbered sunspot regions visible look to have the potential for
generating a significant flare, although the background X-ray flux is
rising. That bears watching over the next few days.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 92
SFI : 109
A index : 32
K index : 4
Solar wind speed : 744.5 km/sec
Solar wind density : 0.9 protons/cc
Solar wind pressure : 1.2 nPa
IMF : 5.4 nT
IMF Orientation : 3.4 nT South
Conditions for the last 24 hours :
Space weather for the past 24 hours has been moderate. Geomagnetic
storms reaching the G2 level occurred.
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 be low.
Geomagnetic activity forecast :
The geomagnetic field is expected to be at active to minor storm
levels for the next two days, then calming to be unsettled to active
by day three. The high speed stream should buffet the magnetosphere
for the majority of the period.
Recent significant solar flare activity :