[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 September 23 issued 2330 UT on 11 Sep 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 SEPTEMBER) 
Date   T index  Conditions    
11 Sep   105    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.3    0128UT  possible   lower  West Pacific
  M1.1    0407UT  possible   lower  E. Asia/Aust.
  M1.1    1449UT  possible   lower  South American/
                                    Atlantic

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

PCA Event : No event.

Monthly T index:
Month  T index
Aug      115
Sep      96
Oct      93


2. FORECAST (12 SEPTEMBER - 14 SEPTEMBER)
Date   T index  Conditions       MUFs                              
12 Sep   110    Normal           Near predicted monthly values
13 Sep   110    Normal           Near predicted monthly values    
14 Sep   110    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 89 was issued on 
11 September and is current for 11-13 Sep. Maximum usable frequencies 
(MUFs) on UT day 11-Sep were near predicted monthly values to 
20% enhanced in the Australian region. Spread F was observed 
at Hobart during local night hours. Ionospheric scintillation 
was observed at Niue 11/0717-0740UT. Very minor fadeouts may 
have been experienced at 11/0128UT and 11/0407UT in association 
with M1 flare activity. MUFs are expected to be near predicted 
monthly values over 12-14 Sep. Isolated minor shortwave fadeouts 
are possible.

----------------------------------------------------------
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