[ips-sf] IPS Summary Forecast for 21 August - issued 2336UT/20-Aug-2013

rwc rwc at ips.gov.au
Wed Aug 21 09:36:40 EST 2013

A weak shock was observed in the solar wind late in the UT day of the
20th of August with a sudden but mild elevation of the wind speed,
density and magnetic field strength. This is mostly likely due to the
edge of a coronal mass ejection (CME) observed on the 17th of August
passing the Earth. Unsettled geomagnetic conditions have been caused
by this event, but nothing more significant is expected from it. Some
Active periods of geomagnetic activity may be experienced over the
next 2 days due to an expected high speed solar wind stream caused by
a coronal hole. A strong CME was observed on the 20th of August,
directed mostly to the south but a reasonable part of this is expected
to strike the Earth on the 23rd of August causing Active to Minor
Storm levels of geomagnetic activity. Solar flare activity is at low
levels and no sunspot regions visible currently have significant
potential to cause strong flares. Conditions for HF radio propagation
are currently normal, some reductions in the maximum useable frequency
may be experienced on the 22nd and 23rd of August due to the expected
geomagnetic activity.

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