[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 December 24 issued 2330 UT on 25 Dec 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 DECEMBER) 
Date   T index  Conditions    
25 Dec   141    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.2 24/2234UT  possible   lower  East Pacific/
                                    North American
  M2.8    0430UT  possible   lower  E. Asia/Aust.
  M4.9    0449UT  possible   lower  E. Asia/Aust.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      127
Dec      117
Jan      114


2. FORECAST (26 DECEMBER - 28 DECEMBER)
Date   T index  Conditions       MUFs                              
26 Dec   110    Normal-fair      Near predicted monthly values
27 Dec   120    Normal           Near predicted monthly values    
28 Dec   135    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 148 was issued on 
23 December and is current for 24-26 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 25-Dec were near predicted 
values. Sporadic-E was observed during local night hours at Hobart, 
Canberra and Brisbane. MUFs are expected to be near predicted 
values to depressed by 10-15% on 26-Dec due to anticipated geomagnetic 
activity. Depressions may continue into 27-Dec but MUFs are expected 
to be near predicted monthly values by 28-Dec. Shortwave fadeouts 
are probable.

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