[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 April 25 issued 2330 UT on 22 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 APRIL) 
Date   T index  Conditions    
22 Apr   113    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.3    1049UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 75% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      126
Apr      115
May      113


2. FORECAST (23 APRIL - 25 APRIL)
Date   T index  Conditions       MUFs                              
23 Apr   100    Normal-fair      Depressed 10 to 20%/near predicted 
                                 monthly values
24 Apr   105    Normal-fair      Depressed 10 to 20%/near predicted 
                                 monthly values    
25 Apr   100    Normal-fair      Depressed 10 to 20%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 41 was issued on 
22 April and is current for 22-23 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 22-Apr were near predicted 
values to 15% depressed. Conditions were a little degraded with 
spread-F being present in Hobart and sporadic-E in Learmonth 
during local night hours. MUFs are expected to be near predicted 
values to 10-20% depressed over 23-25 Apr, however may fluctuate 
through out the period.

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