[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 March 25 issued 2330 UT on 31 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 MARCH) 
Date   T index  Conditions    
31 Mar   150    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.5 30/2319UT  possible   lower  West Pacific
  M1.2    1024UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Enhanced by 20-25%.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.
      Proton event in progress, increased absorption observed.

PCA Event : 10MeV Proton/PCA Event Began 31/1425UT and is in progress

Monthly T index:
Month  T index
Feb      127
Mar      117
Apr      114


2. FORECAST (01 APRIL - 03 APRIL)
Date   T index  Conditions       MUFs                              
01 Apr   140    Normal           Near predicted monthly values 
                                 to 15-20% enhanced.
02 Apr   140    Normal           Near predicted monthly values 
                                 to 15-20% enhanced.    
03 Apr   140    Normal           Near predicted monthly values 
                                 to 15-20% enhanced.   

COMMENT: ASWFC SWF HF Communications Warning 33 was issued on 
31 March and is current for 1-3 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 31-Mar were near predicted 
values to 25% enhanced. Ionospheric equatorial scintillation 
was observed in Weipa and Darwin during the interval 31/1127-1514UT. 
MUFs are generally expected to be near predicted values to 15-20% 
enhanced over 01-03 Apr. Shortwave fadeouts are expected on daylight 
HF circuits.

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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