[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 July 24 issued 2336 UT on 28 Jul 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 JULY 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 JULY) 
Date   T index  Conditions    
28 Jul   117    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M7.8    0151UT  probable   lower  West Pacific
  M9.9    0157UT  probable   lower  West Pacific
  M1.0    1009UT  possible   lower  European
  M7.7    1042UT  probable   lower  European
  M1.3    1826UT  possible   lower  East Pacific/
                                    North American
  M1.9    2036UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   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 (29 JULY - 31 JULY)
Date   T index  Conditions       MUFs                              
29 Jul   120    Normal-fair      Near predicted monthly values
30 Jul    90    Fair-poor        Depressed 10 to 15%/near predicted 
                                 monthly values    
31 Jul    80    Fair-poor        Depressed 10 to 20%/near predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 80 was issued 
on 28 July and is current for 31 Jul to 1 Aug. ASWFC SWF HF Communications 
Warning 81 was issued on 28 July and is current for 28-30 Jul. 
Maximum usable frequencies (MUFs) on UT day 28-Jul were near 
predicted values in the Australian region, with 15% depressions 
during local night hours in the northern Australian region. Spread 
F was observed at Hobart during local night hours. A fadeout 
was observed 28/0146-0237UT. MUFs are expected to be near predicted 
values on 29-Jul. MUFs may become 15% depressed after local dawn 
on 30-Jul and on 31-Jul due to anticipated geomagnetic activity 
induced from recent CMEs. Isolated fadeouts are probable.

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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