[Ips-dhfpr] ASWFC Daily HF Prop Report - 05 March 23 issued 2331 UT on 05 Mar 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/05 MARCH 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (05 MARCH) 
Date   T index  Conditions    
05 Mar   122    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.3    0252UT  possible   lower  E. Asia/Aust.
  M1.1    1641UT  possible   lower  South American/
                                    Atlantic
  M1.0    1701UT  possible   lower  South American/
                                    Atlantic
  M5.0    2136UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 15-25%.
   Niue Island Region:
      Enhanced by 25-30%.
   Northern Australian Region:
      Enhanced by 20-40%.
   Southern Australian Region:
      Variable conditions, MUFs depressed 15% to 30% enhanced.
      Enhanced by 15% during local night.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 15% over the UT day, with periods of absorption at Mawson.

PCA Event : No event.

Monthly T index:
Month  T index
Feb      117
Mar      80
Apr      80


2. FORECAST (06 MARCH - 08 MARCH)
Date   T index  Conditions       MUFs                              
06 Mar    80    Normal-fair      Depressed 15 to 20%/enhanced 
                                 10 to 20%
07 Mar    90    Normal           Depressed 10 to 15%/enhanced 
                                 10 to 20%    
08 Mar   110    Normal           About 15% above predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 26 was issued on 
4 March and is current for 4-6 Mar. ASWFC HF Communications Warning 
27 was issued on 5 March and is current for 6-7 Mar. Maximum 
usable frequencies (MUFs) on UT day 05-Mar were 20-40% enhanced 
in the northern Australian region. Southern Australian region 
MUFs were depressed 15% during the local day at Canberra and 
Hobart, whilst 30% enhanced at Perth during the local day. Mild 
spread-F was observed at Hobart during local night hours. MUFs 
are expected to be depressed 15-20% for the southern Australian 
region and near to 15% enhanced in the northern Australian region 
during 05-06 Mar. A very brief (less than 10 minutes) minor fadeout 
may have been experienced due to the M5 flare at 05/2135UT. HF 
communicators in the southern Australian region should use a 
T-index of 50,and northern Australian region HF communicators 
should use a T-index of 110.

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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