[Ips-dhfpr] ASWFC Daily HF Prop Report - 24 March 24 issued 2330 UT on 24 Mar 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/24 MARCH 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (24 MARCH) 
Date   T index  Conditions    
24 Mar    96    Fair           

Flares    Max     Fadeout    Freq.  Sectors
  M2.4 23/2349UT  possible   lower  West Pacific
  M1.4    0125UT  possible   lower  West Pacific
  M2.0    0152UT  possible   lower  West Pacific
  M2.7    0218UT  possible   lower  E. Asia/Aust.
  M1.1    0403UT  possible   lower  E. Asia/Aust.
  M2.2    0606UT  possible   lower  Mid East/Indian
  M1.3    0751UT  possible   lower  Mid East/Indian
  M1.1    1218UT  possible   lower  European
  M1.0    1234UT  possible   lower  European
  M1.2    1314UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Depressed by 15% during local night.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 30% during local day.
      Near predicted monthly values during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      No data available over the UT day.
      Proton event in progress, increased absorption observed.

PCA Event : 10MeV Proton/PCA Event Began 23 03 2024 0805UT and is in progress

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


2. FORECAST (25 MARCH - 27 MARCH)
Date   T index  Conditions       MUFs                              
25 Mar    80    Fair             Near predicted predicted values 
                                 to 20-40% depressed
26 Mar    80    Fair             Depressed 20-40%    
27 Mar    90    Normal-fair      Depressed 20-40%   

COMMENT: ASWFC SWF HF Communications Warning 31 was issued on 
23 March and is current for 24-26 Mar. ASWFC HF Communications 
Warning 32 was issued on 24 March and is current for 24-26 Mar. 
Maximum usable frequencies (MUFs) on UT day 24-Mar were near 
predicted values in the Australian region, with 30% depressions 
in the southern Australian regions. MUF depressions were due 
to significant geomagnetic activity that occurred on 24-Mar. 
Some spread-F was observed in Hobart. A polar cap absorption 
event (PCA) has been ongoing and is affecting ionospheric conditions 
in the polar regions. 

MUFs are expected to be initially near 
predicted values on 25-Mar but may become depressed by 20-40% 
over 26-27 Mar. The PCA event is expected to affect ionospheric 
conditions in the polar regions on 25-Mar. 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