Solar Activity Report for 12/17/03
- Today's solar activity report is dedicated to the 100th anniversary of
the birth of aviation. It all started 100 years ago today, with a
flight that lasted about 12 seconds. I can scarcely imagine what the
next 100 years will bring...
Conditions remain calm this evening, and the A and K index values are
the lowest they've been in awhile. However, there are things afoot
that could change that soon. First of all, SOHO satellite ultraviolet
imagery shows that there is an active sunspot region just over the
eastern limb of the solar disk. That may increase level of solar
activity along about the 20th. Additionally, there's also a large
sunspot region that is now transiting the back side of the sun,
although that won't be a factor for awhile yet. Finally, there's a
coronal hole that is currently in the process of rotating into an
Earth-pointing position. We should be seeing higher solar wind speeds
from that around the 21st.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 92
SFI : 118
A index : 10
K index : 1
Solar wind speed : 417.9 km/sec
Solar wind density : 2.1 protons/cc
Solar wind pressure : 0.6 nPa
IMF : 3.9 nT
IMF Orientation : 2.3 nT South
Conditions for the last 24 hours :
No space weather storms were observed for the past 24 hours.
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 low. Active regions observed on EIT
imagery just beyond the east limb may increase the level of solar
activity beginning 20 December.
Geomagnetic activity forecast :
The geomagnetic field is expected to be quiet to unsettled. A coronal
hole rotating into geoeffective position on 19 December may produce
elevated solar wind speed, resulting in isolated active to minor storm
conditions in the geomagnetic field on 19-20 December.
Recent significant solar flare activity :