[ips-sf] IPS Summary Forecast for 24 December - issued 2346UT/23-Dec-2015 [SEC=UNCLASSIFIED]

rwc rwc at ips.gov.au
Thu Dec 24 10:46:56 EST 2015

Solar activity during the past 24 hours was at moderate levels with a
strong M4.7 flare and few weak C-class flares. The outlook for the
next 24 hrs is for C-class flares are likely and isolated chance of
stronger M-class flares. HF users are warned for possible shortwave
fadeouts associated with the flaring. The M4.7 flare generated a
coronal mass ejection (CME) with an estimated speed of 554 km/s and a
Type II radio burst of estimated shock speed 1300 km/s. However, the
CME is propagating to the southeast with an Earth impact unlikely. The
solar winds are moderately elevated and currently near 500 km/s. These
solar winds are the possible effects of a southern hemisphere coronal
hole becoming geoeffective. Conditions for HF radio wave propagation
have improved and are now near the predicted monthly values.

Space Weather Services              email: asfc at ips.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 

IMPORTANT: This e-mail, including any attachments, may contain,
confidential or copyright information.  The views expressed in 
this message are those of the individual sender, unless 
specifically stated to be the views of IPS.  If you are not 
the intended recipient, please contact the sender immediately 
and delete all copies of this e-mail and attachments. 
To unsubscribe from an IPS mail list either send an email to 
"MAIL_LIST"-leave at ips.gov.au or go to
Information about training can be obtained from
General information is available from

More information about the ips-sf mailing list