[Ips-dhfpr] IPS Daily HF Prop Report - 22 May 07

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 22/2330Z MAY 2007 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 MAY) 
Date   T index  Conditions    
22 May    10    Normal         

Flares: none.

MUFs:
   Equatorial PNG/Niue Region:
      Depressed by 20% during local day,
      Depressed by 25% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values,
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 45% over the UT day.

PCA Event : No event.

Predicted Monthly T index for May:   9
2. FORECAST (23 MAY - 25 MAY)
Date   T index  Conditions       MUFs                              
23 May    12    Normal           near predicted monthly values 
24 May    26    Normal           10 to 20% above predicted monthly 
                                 values     
25 May    30    Normal           10 to 20% above predicted monthly 
                                 values    

COMMENT: HF conditions were mostly normal 22 May at mid latitudes. 
Equatorial stations suffered 25-30% MUF depressions over the 
UT day. Mid-high latitude stations were enhanced overnight. Periods 
of Spread-F were again observed overnight at mid- high latitude 
stations. Widespread occurrence of Sporadic-E was observed at 
Low and Mid-latitudes for a 2-3 hour period after dusk. HF conditions 
are expected to be mostly normal 23 May at mid-high latitudes. 
Low latitudes may experience further depressions. MUF enhancements 
are expected 24-25 May as the winter ionosphere responds to enhanced 
geomagnetic activity. 

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For an explanation of some of the terms in this report, goto
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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