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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (18 JULY) 
Date   T index  Conditions    
18 Jul   141    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.2    1014UT  possible   lower  European
  M2.0    1027UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Enhanced by 20-40%.
   Niue Island Region:
      Enhanced by 15-40%.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 35% 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 (19 JULY - 21 JULY)
Date   T index  Conditions       MUFs                              
19 Jul   125    Normal           Near to 15% above predicted 
                                 monthly values
20 Jul   125    Normal           Near to 15% above predicted 
                                 monthly values    
21 Jul   125    Normal           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 18-Jul were near predicted monthly values to 
35% enhanced in the Australian region. Spread F was observed 
at Hobart, Brisbane and Darwin during local night hours. Ionospheric 
scintillation was observed at Darwin at 18/0929-0950UT. MUFs 
are expected to be near predicted monthly values to 15% enhanced 
over 19-21 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