[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 March 23 issued 2330 UT on 20 Mar 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 MARCH 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 MARCH) 
Date   T index  Conditions    
20 Mar   144    Normal         

Flares    Max     Fadeout    Freq.  Sectors
 M1/--    0148UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Enhanced by 30% during local night.
      Enhanced by 40% after local dawn.
   Niue Island Region:
      Enhanced by 50% during local day.
      Enhanced by 65% during local night.
      Enhanced by 40% after local dawn.
   Northern Australian Region:
      Enhanced by 25% during local day.
      Enhanced by 40% during local night.
      Enhanced by 65% after local dawn.
   Southern Australian Region:
      Enhanced by 35% during local day.
      Enhanced by 20% during local night.
      Enhanced by 30% after local dawn.
   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
Feb      117
Mar      80
Apr      80


2. FORECAST (21 MARCH - 23 MARCH)
Date   T index  Conditions       MUFs                              
21 Mar   140    Normal           20 to 40% above predicted monthly 
                                 values
22 Mar   140    Normal           20 to 40% above predicted monthly 
                                 values    
23 Mar   115    Normal           20% enhanced to near predicated 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 31 was issued on 
20 March and is current for 20-22 Mar. Maximum usable frequencies 
(MUFs) on UT day 20-Mar in the Australian region were enhanced 
by 20-65%. Scintillation was observed at Darwin and Weipa between 
20/1058-1440UT. MUFs are expected to be enhanced by 20-40% over 
21-22 Mar, and tending towards monthly predicted values by 23-Mar 
due to anticipated geomagnetic activity. Isolated minor shortwave 
fadeouts are possible.

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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