[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 August 24 issued 2330 UT on 18 Aug 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 AUGUST 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 AUGUST) 
Date   T index  Conditions    
18 Aug   181    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M2.4    0204UT  possible   lower  E. Asia/Aust.
  M1.1    0416UT  possible   lower  E. Asia/Aust.
  M1.2    0731UT  possible   lower  Mid East/Indian
  M1.3    2108UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 85% during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 55% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 30% during local night.
   Southern Australian Region:
      Enhanced by 25-35%.
   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 (19 AUGUST - 21 AUGUST)
Date   T index  Conditions       MUFs                              
19 Aug   160    Normal           15 to 25% above predicted monthly 
                                 values
20 Aug   160    Normal           15 to 25% above predicted monthly 
                                 values    
21 Aug   160    Normal           15 to 25% above predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 93 was issued on 
18 August and is current for 18-20 Aug. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 18-Aug were near predicted 
monthly values to 35% enhanced. Strong local night enhancements 
were observed at Niue and Cocos Island. Spread F was observed 
at Hobart during local night hours. Range spread was observed 
at Niue at 18/1300UT and 18/1500-1700UT. Ionospheric scintillation 
was observed at Niue and Weipa during the interval 18/1015-1120UT. 
MUFs are expected to be 15-25% enhanced over 19-21 Aug. Isolated 
shortwave fadeouts are probable.

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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