[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 July 24 issued 2333 UT on 22 Jul 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 JULY 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 JULY) 
Date   T index  Conditions    
22 Jul   138    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M3.2 21/2328UT  possible   lower  West Pacific
  M1.4    0333UT  possible   lower  E. Asia/Aust.
  M3.9    0404UT  possible   lower  E. Asia/Aust.
  M1.9    0434UT  possible   lower  E. Asia/Aust.
  M1.4    0935UT  possible   lower  Mid East/Indian
  M1.5    1300UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
   Niue Island Region:
      Enhanced by 35% during local day.
      Enhanced by 70% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

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


2. FORECAST (23 JULY - 25 JULY)
Date   T index  Conditions       MUFs                              
23 Jul   135    Normal           Near predicted monthly values
24 Jul   125    Normal-fair      Near predicted monthly values    
25 Jul    90    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 77 was issued 
on 22 July and is current for 24-25 Jul. ASWFC SWF HF Communications 
Warning 78 was issued on 22 July and is current for 23-25 Jul. 
Maximum usable frequencies (MUFs) on UT day 22-Jul were near 
predicted values to 30% enhanced in the Australian region. A 
minor HF fadeout was observed 22/0402-0408UT. Spread-F was observed 
at Hobart and Learmonth during local night hours. MUFs are generally 
expected to be near predicted values to 15% enhanced over 23-24 
Jul, with a mild to moderate degradation in HF communications 
quality possible during local night hours on 24-Jul in association 
with an expected increase in geomagnetic activity. Brief depressions 
of 15% are possible early in the UT day on 25-Jul for the southern 
Australian region only. Isolated minor HF 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