[Ips-dhfpr] ASWFC Daily HF Prop Report - 02 December 22 issued 2331 UT on 02 Dec 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/02 DECEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (02 DECEMBER) 
Date   T index  Conditions    
02 Dec    47    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 25-40%.
   Niue Island Region:
      Enhanced by 25-50%.
   Northern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      77
Dec      70
Jan      70


2. FORECAST (03 DECEMBER - 05 DECEMBER)
Date   T index  Conditions       MUFs                              
03 Dec    35    Normal-fair      Depressed 10 to 20%/near predicted 
                                 monthly values
04 Dec    50    Normal           Depressed 5 to 10%/near predicted 
                                 monthly values    
05 Dec    65    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 93 was issued on 30 
November and is current for 1-3 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 02-Dec were variable. 
Strong MUF enhancements were observed at Niue and strong depressions 
were observed at Cocos Island. Northern region Australia MUFs 
were depressed early in the UT day. The low latitude ionospheric 
variation is not considered associated with the current mild 
geomagnetic activity. Western Australian region MUFs (Perth/Learmonth) 
were also depressed. South east Australian MUFs were mildly enhanced 
during the local day yesterday. Some sites are again showing 
depressed conditions of 15-20% at times after local dawn this 
morning. Further degraded HF conditions may be experienced during 
local night hours on 03-Dec for the southern Australian region 
as coronal hole wind stream induced geomagnetic activity declines. 
There is a chance for weak CME induced geomagnetic activity late 
on 03-Nov. Frequencies of ionospheric support are now expected 
to return to near normal from 05-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