[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 July 24 issued 2330 UT on 21 Jul 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 JULY 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 JULY) 
Date   T index  Conditions    
21 Jul   143    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.4    0355UT  possible   lower  E. Asia/Aust.
  M1.5    0834UT  possible   lower  Mid East/Indian
  M1.0    1632UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 75% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 25% over the UT day.

PCA Event : No event.

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


2. FORECAST (22 JULY - 24 JULY)
Date   T index  Conditions       MUFs                              
22 Jul   135    Normal           Near predicted monthly values 
                                 to 10-30% enhanced
23 Jul   135    Normal           Near predicted monthly values 
                                 to 10-30% enhanced    
24 Jul   125    Fair             Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 76 was issued on 
19 July and is current for 20-22 Jul. Maximum usable frequencies 
(MUFs) on UT day 21-Jul were near predicted values to 35% enhanced 
in the Australian region. Spread-F was observed in Brisbane during 
local dawn hours. Scintillation was observed from 0920 - 1310 
UT in Darwin, Weipa and Niue. MUFs are expected to be near predicted 
values over 22-24 Jul, with enhancements up to 30% over 22-23 
Jul.

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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