[Ips-dhfpr] IPS Daily HF Prop Report - 24 September 01

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SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 24/2330Z SEPTEMBER 2001 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (24 SEPTEMBER) 
Date   T index  Conditions    
24 Sep   130    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
 X2/2B    1038UT  probable   all    European

MUFs:
   Equatorial PNG Region:
      Near predicted monthly values during local day,
      otherwise enhanced greater than 20%.
   Northern Australian Region:
      Enhanced greater than 15%.
   Southern Australian and New Zealand Region:
      Depressed 15-30% during local day otherwise 
      mostly near predicted monthly values.
   Antarctic Region (Casey/Scott Base):
      Depressed 15-30% to near predicted monthly values.


Predicted Monthly T index for September: 108
2. FORECAST (25 SEPTEMBER - 27 SEPTEMBER)
Date   T index  Conditions       MUFs                              
25 Sep   140    Normal           Near predicted monthly values 
                                 to enhanced 15%. 
26 Sep    70    Poor             20 to 40% below predicted monthly 
                                 values     
27 Sep   100    Fair-Poor        depressed 10 to 20%/near predicted 
                                 monthly values    
COMMENT: Mildly degraded HF conditions were observed during the 
local day for Southern Australian and New Zealand regions following 
mildly elevated geomagnetic activity on 23 September. Significantly 
degraded HF conditions have been observed at high lats since 
approximately 16UT on 24 September due to a PCA event and are 
expected to continue to be degraded for the next few days. Mid-low 
latitudes should be mostly near normal for 25 Sept but then are 
expected to be significantly degraded for 26-27 September following 
the impact of a large CME due early on 26 September. Fadeouts 
can be expected on daylight HF circuits. 

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