[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 August 24 issued 2337 UT on 12 Aug 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 AUGUST 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 AUGUST) 
Date   T index  Conditions    
12 Aug   188    Normal-poor    

Flares    Max     Fadeout    Freq.  Sectors
  M1.3 11/2358UT  possible   lower  West Pacific
  M1.0    0849UT  possible   lower  Mid East/Indian
  M1.2    2257UT  possible   lower  East Pacific/
                                    North American
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:
      Enhanced by 35% during local day.
      Enhanced by 90% during local night.
      Enhanced by 35% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 15-45% after local dawn.
   Southern Australian Region:
      Enhanced by 30% during local day.
      Enhanced by 20% during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jul      131
Aug      119
Sep      119


2. FORECAST (13 AUGUST - 15 AUGUST)
Date   T index  Conditions       MUFs                              
13 Aug    70    Poor-fair        Depressed 20 to 40%/near predicted 
                                 monthly values
14 Aug   140    Fair-normal      About 15% above predicted monthly 
                                 values    
15 Aug   150    Normal           About 15% above predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 89 was issued on 
12 August and is current for 12-14 Aug. ASWFC HF Communications 
Warning 91 was issued on 12 August and is current for 13 Aug 
only. Maximum usable frequencies (MUFs) in the Australian region 
on UT day 12-Aug were variable, with the northern Australian 
region MUFs becoming very enhanced during local night hours/predawn 
period and southern Australian region MUFs becoming depressed 
20-40% after local dawn this morning. Northern Australian region 
MUFs are currently enhanced 20% after local dawn this morning. 
Ionospheric scintillation was observed at Darwin 12/1201-1220UT. 
Strong spread F was observed at Hobart during local night hours. 
Southern Australian region MUFs are expected to be depressed 
30% during the local day today, with a slow recovering trend. 
Northern Australian region MUFs are generally expected to remain 
near predicted monthly values. Shortwave fadeouts are possible.

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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