[ips-sf] SWS Summary Forecast for 21 May - issued 2343UT/20-May-2017 [SEC=UNCLASSIFIED]

[rwc]

Solar activity was very low today (UT day 20 May). As anticipated, the
effect of the negative polarity coronal hole kept the solar wind
stream strong. Solar wind stream is expected to stay strong for the
next two to three days. Very low levels of solar activity with some
possibility of isolated C-class event may be expected for the next
three days (21 to 23 May). As anticipated, due to the effect of a
coronal hole, the geomagnetic activity increased up to minor storm
levels today with isolated major storm periods at some high latitude
locations. The effect of this coronal hole is expected to keep
geomagnetic activity enhanced for the next 2 to 3 days. Against
anticipations, despite high levels of geomagnetic activity today,
minor to moderate MUF enhancements were observed. Minor to moderate
MUF depressions and degradation in HF conditions on 21 May and minor
to mild MUF depressions and degradation in HF conditions on 22 May,
may be expected. HF conditions are expected to recover to mostly
normal levels on 23 May.

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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