[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 July 24 issued 2330 UT on 17 Jul 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 JULY 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 JULY) 
Date   T index  Conditions    
17 Jul   143    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M5.0    0639UT  possible   lower  Mid East/Indian
  M3.4    0708UT  possible   lower  Mid East/Indian
  M1.2    0948UT  possible   lower  Mid East/Indian
  M1.2    1951UT  possible   lower  East Pacific/
                                    North American
  M2.0    1958UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 40% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 25% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jun      120
Jul      118
Aug      117


2. FORECAST (18 JULY - 20 JULY)
Date   T index  Conditions       MUFs                              
18 Jul   125    Normal           Near to 15% above predicted 
                                 monthly values
19 Jul   125    Normal           Near to 15% above predicted 
                                 monthly values    
20 Jul   125    Normal-fair      Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 75 was issued on 
16 July and is current for 17-19 Jul. Maximum usable frequencies 
(MUFs) on UT day 17-Jul were near predicted monthly values to 
25% enhanced in the Australian region. Spread F was observed 
at Hobart during local night hours. Brief weak ionospheric scintillation 
was observed at Weipa at 17/1250UT. A minor fadeout impacting 
lower HF frequencies for western Australian sites was observed 
at 17/0700UT. MUFs are expected to be near predicted monthly 
values to 15% enhanced over 18-20 Jul. 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