Solar Activity Report for 2/11/04
- View Source** Aurora Watch In Effect **
The Earth has moved inside of a high-speed coronal hole solar wind
stream, and the solar wind speed is within shouting distance of 600
km/sec. Unfortunately, the interplanetary magnetic field has taken on
a north-pointing orientation, which suppresses geomagnetic activity
and aurora. Still, however, that didn't stop the geomagnetic field
from reaching the G-2 geomagnetic storm level earlier today, and an
aurora watch is in effect. The current level of activity is expected
to continue for at least the next 48 hours. Sunspot regions 551 and
554 have at least a small chance of producing an M-class flare.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 91
SFI : 114
A index : 23
K index : 3
Solar wind speed : 584.0 km/sec
Solar wind density : 4.2 protons/cc
Solar wind pressure : 2.4 nPa
IMF : 18.4 nT
IMF Orientation : 8.6 nT North
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. Regions 554 and 551 may produce
C-class flares. There is a slight chance for an isolated M-class flare.
Geomagnetic activity forecast :
The geomagnetic field is expected to be at quiet to minor storm levels
on 12 and 13 February as a coronal hole high speed stream moves into
geoeffective position. Activity should subside to quiet to active
levels on 14 February.
Recent sigificant solar flare activity :