[Ips-dhfpr] ASWFC Daily HF Prop Report - 13 August 24 issued 2330 UT on 13 Aug 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/13 AUGUST 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 AUGUST) 
Date   T index  Conditions    
13 Aug   146    Poor-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    1729UT  possible   lower  South American/
                                    Atlantic
  M1.3    2245UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 20-25%
   Niue Island Region:
      Enhanced by 20-55% 
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
      Enhanced by 25% after local dawn.
   Southern Australian Region:
      Depressed by 40% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (14 AUGUST - 16 AUGUST)
Date   T index  Conditions       MUFs                              
14 Aug   150    Normal           About 15% above predicted monthly 
                                 values
15 Aug   150    Normal           About 15% above predicted monthly 
                                 values    
16 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 Preliminary HF 
Communications Warning 90 was issued on 12 August and is current 
for 12-14 Aug. Maximum usable frequencies (MUFs) in the Australian 
region on UT day 13-Aug were variable, with northern Australian 
region MUFs near normal during the local day then becoming 25% 
enhanced during the local night. Southern Australian region MUFs 
were strongly depressed by up to 40% during the local day then 
recovering. Ionospheric scintillation was observed at Darwin, 
Nuie and Weipa during the interval 13/0848-1150UT. Strong spread 
F was observed at Hobart and Perth during local night hours. 
MUFs are expected to be near predicted monthly values to 15% 
enhanced for 14-16 Aug. Isolated 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