Solar Activity Report for 4/3/04
- ** Aurora Watch In Effect **
Remember the long duration C-class flare I mentioned a few days ago?
Well, it's associated CME struck home today, and triggered a G-1
geomagnetic storm. Skywatchers in the higher latitudes should keep an
eye out for aurora. There was some uncertainty as to whether or not
there had been a CME, as SOHO satellite data is somewhat lacking for
the time being. That situation will be corrected in a few days. Thge
active conditions caused by the shock passage are expected to last for
at least the next 24 hours. Then, the Earth will move into a high
speed solar wind stream coming from a coronal hole that has rotated
into an Earth-pointing position. That could add to the activity,
possibly even kicking things up to the major storm level. There are
four numbered sunspot regions visible, although none appear capable of
generating a significant flare at this time. However, as you've just
seen, it doesn't necessarily take a large flare to produce a CME.
The current and solar geomagnetic conditions are :
NOAA sunspot number : 68
SFI : 107
A index : 26
K index : 3
Solar wind speed : 479.2 km/sec
Solar wind density : 1.8 protons/cc
Solar wind pressure : 0.6 nPa
IMF : 13.0 nT
IMF Orientation : 2.0 nT North
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 :
No space weather storms are expected for the next 24 hours.
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 predominantly active levels
for 4-5 April. During the first two days, isolated minor storm
conditions may persist especially in the nighttime sectors, due to the
potential of further transient activity, and the likelihood of a
recurrent co-rotating interaction region. Major storm levels are
expected due to a strong recurrent high speed coronal hole stream that
is due to become geoeffective on 6 April.
Recent significant solar flare activity :