Product: Weekly Highlights and Forecasts
:Issued: 2009 Dec 29 2121 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact: www.swpc.noaa.gov/weekly.html
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
21 - 27 December 2009
Solar activity was at low levels during 21-23 December. Region 1036 (S27, L=209, class/area, Dso/070 on 22 December) produced numerous B-flares and C-flares, including a C7.2/sf event at 22/0456Z, with an associated slow-moving, partial-halo CME. A Type II radio sweep
(estimated velocity 531 km/s) and discrete frequency radio bursts, the largest of which was 4900 sfu at 245 MHz, was associated with this flare. Region 1036 also produced a C6.4/sf at 23/1017Z. Region 1036 decayed to spotless plage on 25 December. Region 1035 (N31, L=248, class/area, Eho/310 on 21 December) was the largest region in area and sunspot number, but remained stable while rotating off the disk on 23 December. Solar activity was at very low levels for the rest of the period 24-27 December. On December 26, a new region was numbered as Region 1039 (S27, L=054, class/area, Dso/100 on 27 December).
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at normal background levels during the period.
Geomagnetic field activity was at quiet levels during the entire period 21-27 December. Observations by the ACE spacecraft were consistent with the arrival of a partial-halo coronal mass ejection (CME) on 22 December. The solar wind speed increased to 354 km/s at
25/1708Z as the density increased to a peak of 13 p/cc. The interplanetary magnetic field (IMF) increased, with the total field reaching +10 nT at 25/1852Z. The southward component of the IMF ranged between -10 nT and +7 nT, with a peak of -10 nT at 25/1609Z.
Forecast of Solar and Geomagnetic Activity30 December 2009 - 25 January 2010
Solar activity is expected to be at predominantly very low levels during the first half of the period. Activity is expected to be at very low to low levels during the second half of the period.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at normal levels through the period.
The geomagnetic field is expected to be mostly at quiet levels for the forecast period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2009 Dec 29 2121 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact: www.swpc.noaa.gov/wwire.html
#
# 27-day Space Weather Outlook Table
# Issued 2009 Dec 29
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2009 Dec 30 78 5 2
2009 Dec 31 79 5 2
2010 Jan 01 79 5 2
2010 Jan 02 79 5 2
2010 Jan 03 79 5 2
2010 Jan 04 80 5 2
2010 Jan 05 80 5 2
2010 Jan 06 80 5 2
2010 Jan 07 80 5 2
2010 Jan 08 82 5 2
2010 Jan 09 82 5 2
2010 Jan 10 82 5 2
2010 Jan 11 82 5 2
2010 Jan 12 82 5 2
2010 Jan 13 82 5 2
2010 Jan 14 82 5 2
2010 Jan 15 82 5 2
2010 Jan 16 82 5 2
2010 Jan 17 80 5 2
2010 Jan 18 80 5 2
2010 Jan 19 80 5 2
2010 Jan 20 80 5 2
2010 Jan 21 78 5 2
2010 Jan 22 78 5 2
2010 Jan 23 78 5 2
2010 Jan 24 76 5 2
2010 Jan 25 76 5 2
(NOAA)
