Solar Activity Report for 8/31/05
- ** G-1 Geomagnetic Storm In Progress **
** Aurora Watch In Effect **
You normally don't think of a 500 km/sec solar wind as something to
kick up G-2 geomagnetic storm, but that's what's happened within the
last 24 hours. The solar wind density is higher than I've seen it in
awhile, so that may have someting to do with it. The culprit is a
relatively small coronal hole that's in an Earth pointing position.
The effects are expected to last for the next three days. Also worthy
of note today is a big, bright, full-halo CME. The originator of this
event was a long-duration C-2 class flare. Remember, it isn't the
size that matters, but how long it lasts. (Sorry, couldn't resist)
The CME is expected to arrive on or about the 2nd. Major geomagnetic
storm conditions are a possibility. Stay tuned. Three small sunspot
regions are currently visible. None of them look to have the
potential of generating a significant flare at the present time, but
as we've just seen, it doesn't have to be a big flare to make things
The current solar and geomagnetic conditions are :
NOAA sunspot number : 48
SFI : 83
A index : 25
K index : 5
Solar wind speed : 503.1 km/sec
Solar wind density : 7.7 protons/cc
Solar wind pressure : 3.3 nPa
IMF : 5.2 nT
IMF Orientation : 2.5 nT South
GOES-12 Background X-ray Flux level : A7
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 at very low to low levels.
Geomagnetic activity forecast :
The geomagnetic field is expected to be at quiet to minor storm
levels. A coronal hole may keep conditions elevated throughout the
period. Isolated major storm conditions may be possible on 2 September
due to the effects of the full halo CME from the long duration C2
x-ray event that occurred today.
Recent significant solar flare activity :