[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 August 22 issued 2330 UT on 18 Aug 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 AUGUST 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 AUGUST) 
Date   T index  Conditions    
18 Aug    70    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.4    1009UT  possible   lower  European
  M1.6    1055UT  possible   lower  European
  M1.3    1413UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 40% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jul      65
Aug      67
Sep      68


2. FORECAST (19 AUGUST - 21 AUGUST)
Date   T index  Conditions       MUFs                              
19 Aug    60    Normal-fair      Near predicted monthly values
20 Aug    60    Fair             Near predicted monthly values    
21 Aug    55    Normal-fair      Near predicted monthly values   

COMMENT: SWS SWF HF Communications Warning 60 was issued on 17 
August and is current for 18-20 Aug. Maximum usable frequencies 
(MUFs) on UT day 18-Aug were mostly near predicted monthly values. 
Spread-F was observed during local night in the Australian region. 
Depressions of up to 30% were observed in Darwin over local night. 
MUFs are expected to be mostly near predicted monthly values 
with mild depressions possible for the southern Australian region 
over 19-21 Aug due to the combined effects of a waning coronal 
hole high speed wind stream and the expected arrival of CMEs 
first observed on 16-Aug, 17-Aug and 18-Aug.

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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