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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (25 OCTOBER) 
Date   T index  Conditions    
25 Oct   151    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    0733UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 40% during local night.
      Enhanced by 25% after local dawn.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% 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
Sep      147
Oct      116
Nov      115


2. FORECAST (26 OCTOBER - 28 OCTOBER)
Date   T index  Conditions       MUFs                              
26 Oct   140    Normal-fair      Near predicted monthly values 
                                 to 15% enhanced
27 Oct   100    Fair             Depressed 15% to near predicted 
                                 monthly values    
28 Oct   120    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 121 was 
issued on 24 October and is current for 26-27 Oct. Maximum usable 
frequencies (MUFs) in the Australian region on UT day 25-Oct 
were near predicted values to 30% enhanced. Strong enhancements 
were observed during local night hours for the northern Australian 
region. Spread F was observed during local night hours at Hobart 
and during the interval 25/1400-1500UT at Darwin. Equatorial 
scintillation was observed at Darwin during the interval 25/1259-1330UT. 
MUFs are initially expected to be near predicted values to 15% 
enhanced on 26-Oct. Degraded HF conditions may be experienced 
during local night hours on 26-Oct for the southern Australian 
region. MUFs may become 15% depressed in the southern Australian 
region on 27-Oct due to anticipated geomagnetic activity on 26-Oct.

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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