[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 01/09
ISSUED AT 19/2133Z MARCH 2001
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

TWO WEAK SHOCKS WERE OBSERVED IN THE SOLAR WIND
AT 1021UT and 1441UT ON 19 MARCH. TWO MINOR
STORM PERIODS FOLLOWED IMPULSES. 

SOUTHERN REGION (MID TO HIGH LATITUDES) AUS/NZ MUFS 
ARE BECOMING DEPRESSED AFTER LOCAL DAWN THIS MORNING. 
DEPRESSIONS ARE EXPECTED FOR FIRST HALF OF DAY FOR 
SOUTHERN REGION AUS/NZ THEN RECOVERING.

NORTHERN REGION (LOW LATITUDES) MUFS ARE EXPECTED TO 
REMAIN NEAR NORMAL, DUE TO SHORT DURATION AND MODERATE 
MAGNITUDE OF GEOMAGNETIC ACTIVITY. HF COMMUNICATORS IN 
NORTHERN AUS/EQUATORIAL REGIONS SHOULD CONTINUE TO USE 
THE MONTHLY T INDEX OF 115.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
20 Mar:  low                  None expected         

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
MID TO HIGH LATITUDES ONLY         FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
20 Mar   70    -15%           2  4  6  8 12 12 16 22 

IPS Radio and Space Services      | email: asfc at ips.gov.au
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