[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 2107 UT on 18 Dec 2023 [SEC=OFFICIAL]

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SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 23/131
ISSUED AT 2106UT/18 DECEMBER 2023
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Southern Australian regional MUFs were depressed by up to 30% 
during the local day yesterday and depressed 15-20% after local 
dawn this morning. Depressions in the frequencies of ionospheric 
support are stronger in the southern Australian region, with 
only mild (15%) depressions in the northern Australian region. 
MUFs may recover later in the local day today.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 19 DECEMBER 2023
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS
       T-index      MUFs        2  4  6  8 12 16 22 26
_____________________________________________________________
19 Dec:   50   -20%/normal      2  4  6  8  8 12 16 16

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au