[Ips-hf-warning] ASWFC HF COMMS WARNING issued 2124 UT on 22 Oct 2022 [SEC=OFFICIAL]

[rwc]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 22/81
ISSUED AT 2112UT/22 OCTOBER 2022
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

The Australian regional geomagnetic field unexpectedly briefly 
reached G1 overnight, in association with an interval of southward 
interplanetary magnetic field conditions from 22/0830-1700UT. 
The regional ionosphere has responded to this geomagnetic activity 
with southern Australian regional MUFs becoming depressed by 
up to 30% after local dawn this morning. Northern Australian 
regional MUFs are currently near normal (T-index of 60).Depressed
MUFs are now expected for the local day 23-Oct for southern Australian
region.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 23 OCTOBER 2022 SOUTHERN AUSTRALIAN REGION ONLY.
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
   SOUTHERN AUS. REGION              FREQUENCY BANDS
       T-index      MUFs        2  4  6  8 12 16 22 26
_____________________________________________________________
23 Oct:  -10        -30%        2  4  6  6  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