[Ips-dhfpr] IPS Daily HF Prop Report - 19 December 12 issued 2232 UT on 19 Dec 2012

rwc rwc at ips.gov.au
Thu Dec 20 09:32:46 EST 2012


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 DECEMBER 2012 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 DECEMBER) 
Date   T index  Conditions    
19 Dec    69    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Predicted Monthly T index for December:  81


2. FORECAST (20 DECEMBER - 22 DECEMBER)
Date   T index  Conditions       MUFs                              
20 Dec    75    Normal           Near predicted monthly values
21 Dec    80    Normal           Near predicted monthly values    
22 Dec    80    Normal           Near predicted monthly values   

COMMENT: HF frequencies were near monthly medians over the last 
24 hours at mid latitudes except for slight depression during 
daytime at southern latitudes, probably due to reduced EUV as 
two active regions rotated off the disc. At northern near-equatorial 
latitudes there was more variability than mid-latitudes, as usual, 
with a large daytime enhancement NW of Australia. Expect MUFs 
on 20-Dec to average near predicted monthly values as AR1635 
just rotated onto the disc adds in new EUV. Low MUF variability 
expected at mid-latitudes as the geomagnetic field returns to 
Quiet, as long as no prolonged IMF Bz southward periods occur.

----------------------------------------------------------
For an explanation of some of the terms in this report, go to
http://www.ips.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

IPS Radio and Space Services        email: asfc at ips.gov.au
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