[Ips-hf-warning] SWS HF COMMS WARNING issued 2340 UT on 12 May 2021

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 21/14
ISSUED AT 2340UT/12 MAY 2021
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

On UT day 12 May Earth was impacted by a CME associated with 
a DSF causing major storms (G3). In the Australian region, MUFs 
on UT day 13 May are expected to be mostly near predicted monthly 
values during the local day, with some mild to moderate depressions 
expected during the local night. The forecast depressions are 
in response to the observed disturbed conditions. On the 14 May 
MUFs will initially be depressed but then recover late in the 
day. However in the Northern Hemisphere the HF depressions are 
expected to be more prominent and may last for a few days (13-15 
May).

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 13-14 MAY 2021
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
_____________________________________________________________
13 May:    0          -20%      2  4  6  8  8 12 16 16
14 May:    5          -10%      2  4  6  8 12 16 16 22

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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