[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 April 24 issued 2330 UT on 18 Apr 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 APRIL 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 APRIL) 
Date   T index  Conditions    
18 Apr   133    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.6 17/2208UT  possible   lower  East Pacific/
                                    North American
  M2.2    0248UT  possible   lower  E. Asia/Aust.
  M1.3    0739UT  possible   lower  Mid East/Indian
  M1.6    2001UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 85% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 35% 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
Mar      120
Apr      114
May      115


2. FORECAST (19 APRIL - 21 APRIL)
Date   T index  Conditions       MUFs                              
19 Apr   135    Normal           Near to 15% above predicted 
                                 monthly values
20 Apr   135    Normal           Near to 15% above predicted 
                                 monthly values    
21 Apr   135    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 37 was issued on 
18 April and is current for 18-20 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 18-Apr were near predicted 
monthly values, with enhanced conditions observed at Darwin during 
local night. Long periods of spread F were observed at Canberra 
during local night. MUFs are expected to be near predicted monthly 
values to 15% enhanced over 19-21 Apr, with a chance of mild 
depressions in the southern Australian region over 20-21 Apr 
due to possible geomagnetic activity on 20-Apr. Shortwave 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