Product: Weekly Highlights and Forecasts:Issued: 2009 Jul 28 2021 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and web SWPC contact www.swpc.noaa.gov/weekly.html
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
20 - 26 July 2009
Solar activity was very low. No flares were observed. The visible disk was spotless.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at normal levels during 20 - 22 July. Fluxes rose to moderate levels during 23 - 24 July. Fluxes rose to high levels during 25 - 26 July.
Geomagnetic field activity was at mostly quiet levels during 20 - 21 July. Activity increased to major storm levels from 0300 - 1200 UTC on 22 July. Activity decreased to quiet to unsettled levels for the remainder of the day and continuing through 25 July. Activity decreased to quiet levels at all latitudes on 26 July. ACE solar wind measurements indicated the storm conditions on 22 July were associated with the onset of a coronal hole high-speed wind stream.
Solar wind velocities began to gradually increase early on 22 July and eventually reached a maximum of 601 km/sec at 24/0158 UTC. Velocities gradually decreased during the rest of the period.
Interplanetary magnetic field (IMF) changes associated with the onset of the high-speed stream included an increase in IMF Bt (peak 18 nT at 22/0533 UTC) and a sustained period of southward IMF Bz (minimum -18 nT at 22/0703 UTC).
Forecast of Solar and Geomagnetic Activity
29 July - 24 August 2009
Solar activity is expected to be very low.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels during 21 - 22 August. Normal to moderate flux levels are expected during the rest of the period.
Geomagnetic field activity is expected to be at quiet levels during 29 July - 04 August. Quiet levels, with isolated unsettled periods, are expected during 05-06 August due to a recurrent coronal hole. Activity is expected to decrease to quiet levels during 07 - 08 August. Activity is expected to increase to unsettled levels during 09 - 10 August, again due to recurrence. A decrease to quiet levels is expected during 11 - 17 August. A subsequent increase to active
to minor storm levels is expected on 18 August due to another recurrent coronal hole high-speed stream. Activity is expected to decrease to unsettled levels on 19 August followed by a further
decrease to quiet levels during the rest of the period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2009 Jul 28 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 2009 Jul 28
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2009 Jul 29 69 5 2
2009 Jul 30 70 5 2
2009 Jul 31 70 5 2
2009 Aug 01 70 5 2
2009 Aug 02 70 5 2
2009 Aug 03 70 5 2
2009 Aug 04 70 5 2
2009 Aug 05 70 8 3
2009 Aug 06 70 7 3
2009 Aug 07 69 5 2
2009 Aug 08 68 5 2
2009 Aug 09 68 8 3
2009 Aug 10 68 8 3
2009 Aug 11 68 5 2
2009 Aug 12 68 5 2
2009 Aug 13 68 5 2
2009 Aug 14 68 5 2
2009 Aug 15 68 5 2
2009 Aug 16 68 5 2
2009 Aug 17 68 5 2
2009 Aug 18 68 18 5
2009 Aug 19 68 8 3
2009 Aug 20 68 5 2
2009 Aug 21 69 7 3
2009 Aug 22 70 5 2
2009 Aug 23 70 5 2
2009 Aug 24 70 5 2
(NOAA)
