[ips-sf] SWS Summary Forecast for 21 December - issued 2324UT/20-Dec-2016 [SEC=UNCLASSIFIED]

[rwc]

Solar flare activity was very low over the last 24 hours. The
previously anticipated coronal hole effect has not kicked in yet. This
coronal hole effect may start to strengthen the solar wind wind stream
from 21 December. Very low levels of solar activity may be expected
for the next three days (21, 22 and 23 December) with a slight
possibility of isolated C-class activity. Geomagnetic activity stayed
at quiet levels on 20 December. Expected strengthening in solar wind
stream due to the coronal hole effects, may result in enhancements in
geomagnetic activity levels up to minor storm levels from 21 to 23
December. Minor to moderate MUF depressions were observed today.
Depressed conditions are likely to continue in coming days as
geomagnetic activity is expected to rise from today and the level of
ionising radiation is not expected to show any significant increases.

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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