Solar Activity Report for 6/30/03
- ** Aurora Watch In Effect **
The solar wind speed remains very close to the 700 km/sec tonight,
although the solar wind density is a bit lower than I would have
expected. Nevertheless, an aurora watch is still in effect, and G-1
geomagnetic storm conditions have been observed within the last 24
hours. The high solar wind speeds are expected to last about another
day or so, and then will start to taper off. Although sunspot region
375 is quite large, spanning more than 10 Earth diameters from end to
end, it has been quiet thusfar and hasn't generated any significant
flares. For awhile earlier today and late yesterday, the background
X-ray flux had been rising, and it looked as if we might be in for
some action. However, the X-ray flux has since decreased, and only
some minor C-class flares have been observed.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 159
SFI : 128
A index : 24
K index : 2
Solar wind speed : 698.5 km/sec
Solar wind density : 1.1 protons/cc
Solar wind pressure : 0.9 nPa
IMF : 4.4 nT
IMF Orientation : 2.3 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 :
No space weather storms are expected for the next 24 hours.
Solar activity forecast :
Solar activity is expected to be mostly low, but with a chance for an
isolated M-class event sometime during the next three days. Regions
396 and 397 are the most likely sources for energetic flare activity.
Geomagnetic activity forecast :
The geomagnetic field is expected to be unsettled to slightly active
for the next 24 hours. The high speed wind stream is expected to
slowly subside. Predominantly unsettled levels should prevail during
the second and third days, but there will be a chance for isolated
active periods, especially at the higher latitudes.
Recent significant solar flare activity :