[ips-sf] SWS Summary Forecast for 13 July - issued 2335UT/12-Jul-2016 [SEC=UNCLASSIFIED]

rwc rwc at ips.gov.au
Wed Jul 13 09:35:02 EST 2016

Solar activity was very low during 12 July UT. There were no
noteworthy X ray flares. There are currently 4 numbered sunspot
regions on the solar disk, all of them magnetically stable. An
isolated C class flare might occur during the next 2 days. A solar
wind disturbance ahead of fast wind emanating from Coronal Hole 748
arrived at Earth late on 11 July. This disturbance drove a minor Kp=5
geomagnetic storm during 03 UT to 09 UT on 12 July. The solar wind
speed increased from below 500 km/s to above 600 km/s during 12 July.
The solar wind speed may moderate today, 13 July, and then increase
again during 14 July due to the arrival of fast wind from the next
coronal hole, CH 746. Another brief, minor geomagnetic storm is
possible during 14 July. Conditions for HF radio wave propagation are
expected to remain near normal during the next 2 days. Spread F
episodes are becoming more frequent during the local night hours as
the Sun declines towards solar minimum.

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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