Wednesday, July 21, 2010

Weekly Propagation Forecast Bulletins

Product: Weekly Highlights and Forecasts:Issued: 2010 Jul 20 2021 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
12 - 18 July 2010

Solar activity was at very low to low levels during the period. Activity was very low during 12, 15 - 16, and 18 July due to low-level B-class flares from Region 1087 (N20, L=330, class/area Dao/130 on 12 July). Activity was at low levels during 13 - 14 and 17 July due to isolated low-level C-class flares from Region 1087, the largest of which was a C2/Sf at 13/1051 UTC.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at normal to moderate levels.

Geomagnetic field activity ranged from quiet to minor storm levels. Mostly quiet conditions occurred until late on 14 July. Activity increased to unsettled to minor storm levels during 14/2100 - 15/0300 UTC. Activity decreased to quiet to unsettled levels for the rest of 15 July with some active periods detected at high latitudes. Activity decreased to mostly quiet levels for the remainder of the period. ACE solar wind data indicated the increased activity during 14 - 15 July was due to a recurrent coronal hole high-speed stream (CH HSS). The disturbance began with the arrival late on 14 July of a co-rotating interaction region (CIR) in advance of the CH HSS. Interplanetary magnetic field activity during the CIR included increased total field intensity (peak 18 nT at 14/2154 UTC) and intermittent periods of southward Bz (maximum deflection -16 nT at 14/2234 UTC). Solar wind velocities increased during 14 - 15 July and reached a peak of 505 km/sec at 15/0311 UTC. Velocities began to gradually decrease around midday on 15 July.

Forecast of Solar and Geomagnetic Activity
21 July - 16 August 2010

Solar activity is expected to be at very low levels during most of the period. However, there is a chance for isolated C-class flares from Region 1089 until it departs the visible disk on 01 August.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels during 26 July - 07 August. Normal to moderate flux levels are expected during the remainder of the period.

Geomagnetic field activity is expected to be at quiet levels from 21 July through most of 22 July. Activity is expected to increase to unsettled levels late on 22 July as a recurrent coronal hole high-speed stream (CH HSS) begins to disturb the field. Quiet to unsettled levels with a chance for brief active periods are expected during 23 - 29 July as CH HSS effects persist. Activity is expected to decrease to quiet levels during 30 July - 10 August. Activity is
expected to increase to quiet to unsettled levels with a chance for brief active periods during 11 - 12 August due to a recurrent CH HSS. Quiet conditions are expected during 13 - 16 August.

Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2010 Jul 20 2021 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 2010 Jul 20
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2010 Jul 21 82 5 2
2010 Jul 22 82 7 3
2010 Jul 23 82 10 4
2010 Jul 24 80 10 4
2010 Jul 25 80 7 3
2010 Jul 26 78 7 3
2010 Jul 27 76 10 4
2010 Jul 28 74 10 4
2010 Jul 29 74 8 3
2010 Jul 30 72 5 2
2010 Jul 31 72 5 2
2010 Aug 01 72 5 2
2010 Aug 02 72 5 2
2010 Aug 03 74 5 2
2010 Aug 04 76 5 2
2010 Aug 05 78 5 2
2010 Aug 06 80 5 2
2010 Aug 07 80 5 2
2010 Aug 08 80 5 2
2010 Aug 09 80 5 2
2010 Aug 10 78 5 2
2010 Aug 11 78 8 3
2010 Aug 12 78 10 4
2010 Aug 13 78 5 2
2010 Aug 14 78 5 2
2010 Aug 15 80 5 2
2010 Aug 16 82 5 2
(NOAA)