[Ips-dhfpr] ASWFC Daily HF Prop Report - 30 December 24 issued 2330 UT on 30 Dec 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/30 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (30 DECEMBER) 
Date   T index  Conditions    
30 Dec   134    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.9 29/2330UT  possible   lower  West Pacific
  M1.7    0047UT  possible   lower  West Pacific
  M1.7    0300UT  possible   lower  E. Asia/Aust.
  X1.5    0414UT  probable   all    E. Asia/Aust.
  M1.4    0840UT  possible   lower  Mid East/Indian
  M1.7    1011UT  possible   lower  European
  M3.5    1446UT  possible   lower  South American/
                                    Atlantic
  M5.0    1654UT  possible   lower  South American/
                                    Atlantic
  M1.2    1730UT  possible   lower  South American/
                                    Atlantic
  M1.6    1742UT  possible   lower  South American/
                                    Atlantic
  M1.6    1824UT  possible   lower  East Pacific/
                                    North American
  M1.0    2241UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Enhanced by 50% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      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 (31 DECEMBER - 02 JANUARY)
Date   T index  Conditions       MUFs                              
31 Dec   130    Normal-fair      Near predicted monthly values
01 Jan   130    Fair             Near predicted monthly values    
02 Jan   130    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 150 was 
issued on 29 December and is current for 31 Dec to 2 Jan. Maximum 
usable frequencies (MUFs) in the Australian region on UT day 
30-Dec were near predicted monthly values. Sporadic-E at low 
frequencies was common at most sites during local night hours. 
Lower frequencies on daylight HF circuits may have been degraded 
due to high background X-ray flux levels. MUFs are expected to 
be near predicted monthly values over 31-Dec to 02-Jan, with 
a chance of depressions over the whole period due to anticipated 
geomagnetic activity.

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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