[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 July 23 issued 2330 UT on 17 Jul 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 JULY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 JULY) 
Date   T index  Conditions    
17 Jul   118    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M2.7    2255UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Enhanced by 25% during local day.
      Enhanced by 60% during local night.
      Enhanced by 35% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : 10MeV Proton/PCA Event Began at 0625UT 16/07, Ended at 0855UT 16/07

Monthly T index:
Month  T index
Jun      98
Jul      91
Aug      88


2. FORECAST (18 JULY - 20 JULY)
Date   T index  Conditions       MUFs                              
18 Jul   110    Normal-fair      Near predicted monthly values
19 Jul   110    Normal           Near predicted monthly values    
20 Jul   120    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 66 was issued on 
17 July and is current for 17-19 Jul. Maximum usable frequencies 
(MUFs) on UT day 17-Jul in the Australian region were generally 
near predicted monthly values to 15% enhanced. Spread F was observed 
during local night hours at Hobart, Townsville and Darwin. MUFs 
are expected to be near predicted monthly values to 15% depressed 
over 18-19 Jul, due to ongoing and anticipated geomagnetic activity. 
MUFS are expected to be near predicted monthly values on 20-Jul. 
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