[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 March 25 issued 2331 UT on 19 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 MARCH) 
Date   T index  Conditions    
19 Mar   145    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.5    2040UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (20 MARCH - 22 MARCH)
Date   T index  Conditions       MUFs                              
20 Mar   120    Normal-fair      Near predicted values to 15% 
                                 depressed
21 Mar   105    Normal-fair      Near predicted values to 20% 
                                 depressed    
22 Mar   110    Normal-fair      Near predicted monthly values 
                                 to 15% depressed   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 19-Mar were near predicted values to 15% enhanced. 
Significant spread-F was observed in Hobart during local night 
hours. MUFs are expected to be near predicted values to 15-20% 
depressed over 20-22 Mar; initially due to recent coronal hole 
activity, followed by a CME impact, then potentially followed 
by a third CME impact late in the period. Scintillation is possible 
at low and high latitudes over 20-22 Mar.

----------------------------------------------------------
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