[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 December 24 issued 2330 UT on 18 Dec 2024 [SEC=OFFICIAL]

Australian Space Weather Forecasting Centre aswfc at bom.gov.au
Thu Dec 19 10:30:49 AEDT 2024


SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 DECEMBER) 
Date   T index  Conditions    
18 Dec    63    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 30% during local day.
      Depressed by 25% during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 15% during local night.
   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 (19 DECEMBER - 21 DECEMBER)
Date   T index  Conditions       MUFs                              
19 Dec    95    Normal-fair      Near predicted monthly values 
                                 to 10-15% depressed
20 Dec   100    Normal           Near predicted monthly values    
21 Dec   110    Normal           Near predicted monthly values 
                                 to 10-15% enhanced   

COMMENT: ASWFC SWF HF Communications Warning 145 was issued on 
18 December and is current for 18-20 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 18-Dec were depressed 
from 15-30%. Sporadic E was common during local night hours in 
most sites. Conditions at Darwin were significantly degraded 
during local night hours. MUFs are expected to be mildly degraded 
on 19-Dec, but on a general improving trend to near predicted 
monthly values over 20-21 Dec.

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



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