[Ips-dhfpr] IPS Daily HF Prop Report - 28 January 09

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 28/2330Z JANUARY 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 JANUARY) 
Date   T index  Conditions    
28 Jan   -15    Normal-fair    

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Depressed by 15% during local day,
      Depressed by 25% during local night.
   Northern Australian Region:
      Depressed by 25% during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Depressed by 25% 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 January:   6
2. FORECAST (29 JANUARY - 31 JANUARY)
Date   T index  Conditions       MUFs                              
29 Jan   -15    Normal           near predicted monthly values/depressed 
                                 10 to 20% 
30 Jan    -5    Normal           near predicted monthly values/depressed 
                                 0 to 10%     
31 Jan   -10    Normal           near predicted monthly values/depressed 
                                 5 to 15%    
COMMENT: Intermittent sporadic-E events again observed throughout 
the region, often strong blanketing Es that obscured the F-region 
(e.g. Brisbane late in the 28th UT day after local sunrise). 
MUFs were again depressed at mid and equatorial latitudes, particularly 
during the local day. At mid-latitudes a short post-dusk enhancement 
was observed again, more pronounced at northern stations, but 
this only took the foF2 to above monthly average levels at a 
couple of stations. See Current foF2 plots webpage under Australiasia-HF 
Conditions. There were again significant local depressions and 
enhancements in the equatorial region, despite the lack of any 
geomagnetic activity, although they were more muted than previous 
days this week. These are likely caused by high altitude (300km) 
thermospheric winds. Continuing Sporadic-E events seem likely. 
Expect MUFs to continue below monthly averages due to lack of 
sunspot activity for a couple of days. The next coronal hole 
should take effect later in the UT day on the 29th or the 30th 
and the resultant moderate geomagnetic activity should raise 
MUFs closer to predicted monthly averages. 
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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.

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