Product: Weekly Highlights and Forecasts
:Issued: 2013 Jul 29 0846 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 22 - 28 July 2013
Solar activity was low. The largest flare of the week was a C3/Sf from Region 1800 (S08, L=162, class/area=Dao/220) at 28/1223 UTC. Region 1800 was the largest, most magnetically complex (beta-gamma), and most productive region on the visible disk this week. The remaining regions were generally small and docile in comparison. While a few coronal mass ejections (CMEs) were observed throughout the week, analysis suggested none were Earth-directed.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached high levels from 22-25 July and again on 27 July. Remarkably, 25 July marked the last day of a 16 day streak of high electron flux
levels which began on 10 July.
Geomagnetic field activity was at quiet to unsettled levels throughout most of the week, with the exception of 25-26 July. On those two days, planetary conditions reached active levels with a single period of minor storm conditions at high latitudes. The increased activity came in response to the onset of a recurrent,positive-polarity, coronal hole high speed stream. Quiet to unsettled levels returned on 27 July and lasted through the end of the period.
Forecast of Solar and Geomagnetic Activity 29 July - 24 August 2013
Solar activity is expected to be low with a chance for M-class (R1 radio blackouts) flares through 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 high levels through 02 August, and and again after 22 August in response to recurrent coronal hole high speed streams.
Geomagnetic field activity is expected to be at quiet to unsettled levels throughout the forecast period, barring any geoeffective transient features. There is a chance for active levels on 03-04 August and again on 21-23 August in response to recurrent coronal hole high speed streams.