[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 March 24 issued 2331 UT on 22 Mar 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

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

1. SUMMARY (22 MARCH) 
Date   T index  Conditions    
22 Mar   116    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M4.3    2032UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Depressed by 15%.
   Niue Island Region:
      Near predicted monthly values to 15% enhanced.
   Northern Australian Region:
      Near predicted monthly values.
      Learmonth MUFs depressed 15-35% local day.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Perth MUFs depressed 15-30% local day.
      Enhanced by 15% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15-30% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Feb      138
Mar      111
Apr      112


2. FORECAST (23 MARCH - 25 MARCH)
Date   T index  Conditions       MUFs                              
23 Mar   120    Normal           10 to 15% above predicted monthly 
                                 values
24 Mar   120    Fair-normal      10 to 15% above predicted monthly 
                                 values    
25 Mar    90    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 29 was issued on 
22 March and is current for 22-24 Mar. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 22-Mar were near predicted 
monthly values. Perth and Learmonth MUFs were depressed 15-35% 
during the local day. Spread F was observed during local night 
hours. Mild phase scintillation was observed at Darwin 22/12-16UT. 
A brief fadeout impacting lower HF frequencies was observed at 
Niue due to the M4 flare. MUFs are expected to be near predicted 
monthly values to 15% enhanced during 23-34 Mar, with mildly 
depressed conditions possible on 25-Mar for the southern Australian 
region. 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