Solar Activity Report for 9/15/03
- View Source** G-1 Geomagnetic Storm In Progress **
** Aurora Watch in Effect **
It appears as though the CME(s) I mentioned in my last report have
arrived, and a G-1 geomagnetic storm is in progress. While the solar
wind speed didn't increase much at all, peaking out at a little over
400 km/sec, what did happen is that the Interplanetary Magnetic Field
has tilted south. That has the effect of enhancing geomagnetic
activity, so an aurora watch is in effect. A coronal is now in an
Earth-pointing position, and we'll be seeing some high speed solar
wind from it around the end of the week. If the IMF holds on to its
south-pointing orientation, we could see some interesting geomagnetic
activity. Save for a lone sunspot region, the face of the sun is
blank tonight, giving a preview of what the bottom of the sunspot
cycle will look like in a few years. Sunspot count fluctuations are
common, however, so don't be surprised if the sunspot number picks
back up in the days ahead.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 68
SFI : 97
A index : 4
K index : 5
Solar wind speed : 391.2 km/sec
Solar wind density : 2.2 protons/cc
Solar wind pressure : 0.6 nPa
IMF : 9.7 nT
IMF Orientation : 8.6 nT South
Conditions for the last 24 hours :
Space weather for the past 24 hours has been minor. Geomagnetic storms
reaching the G1 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 persist at the low level.
Geomagnetic activity forecast :
The geomagnetic field is expected to be generally unsettled through 17
September. The effects of a high speed solar wind stream are
anticipated 18 September, as active to minor storm conditions are
Recent significant solar flare activity :