[Ips-hf-warning] IPS HF COMMS WARNING

[Regional Warning Centre]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 00/75
ISSUED AT 06/2051Z NOVEMBER 2000
BY THE AUSTRALIAN SPACE FORECAST CENTRE.


A SHOCK WAS OBSERVED IN THE SOLAR WIND AT 0914UT ON
06 NOV. THE SHOCK PROBABLY ORIGINATED FROM RECENT CORONAL
MASS EJECTION EVENTS. A SUDDEN IMPULSE OF 35NT OBSERVED AT
CANBERRA AT 0949UT. MINOR TO MAJOR STORM PERIODS FOLLOWED
IMPULSE.

REGIONAL MUFS BECAME DEPRESSED BY 20-30% AFTER LOCAL DAWN THIS
MORNING, FOLLOWING THIS GEOMAGNETIC ACTIVITY. 

DEGRADED/DEPRESSED HF PROPAGATION CONDITIONS NOW EXPECTED
FOR 07 NOVEMBER 2000.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
07 Nov:  Low to Moderate      Possible             

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
7 Nov   80      -20%          2  4  6  8  8 12 16 16 


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