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

[rwc]

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 

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