[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 January 24 issued 2331 UT on 25 Jan 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 JANUARY 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 JANUARY) 
Date   T index  Conditions    
25 Jan   149    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Enhanced by 25% during local day.
      Enhanced by 25% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Dec      110
Jan      106
Feb      105


2. FORECAST (26 JANUARY - 28 JANUARY)
Date   T index  Conditions       MUFs                              
26 Jan   140    Normal-fair      Near to 15% above predicted 
                                 monthly values
27 Jan   130    Normal           Near to 15% above predicted 
                                 monthly values    
28 Jan   140    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 9 was issued 
on 23 January and is current for 25-27 Jan. Maximum usable frequencies 
(MUFs) on UT day 25-Jan were enhanced by 25% in the southern 
Australian region and enhanced by 15-20% in the northern Australian 
region, with the strongest enhancements observed during local 
night. Brief periods of sporadic-E were observed across the Australian 
region, mostly during local night. MUFs are expected to be near 
predicted monthly values to 15% enhanced over 26-28 Jan, with 
a chance of mild depressions on 27-Jan if anticipated geomagnetic 
activity occurs on 26-Jan. Shortwave fadeouts are possible.

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

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au