[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS PRELIMINARY HF RADIO COMMUNICATIONS WARNING 01/15
ISSUED AT 28/2348Z MARCH 2001
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

DEPRESSED/DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM SECOND HALF OF 30 MARCH 2001 TO 01 APRIL 2001, FOR
MID TO HIGH LATITUIDES.

THE HF SPECTRUM MAY BECOME OCASSIONALLY SQUEEZED DURING THE PERIOD 
30-01 APR, AS LOWER MUFS ARE EXPECTED DURING THIS PERIOD (FOLLOWING 
ANTICIPATED GEOMAGNETIC ACTIVITY FROM RECENT CORONAL MASS EJECTION EVENTS) 
AND AT THE SAME TIME INCREASED ABSORPTION FROM SOLAR FLARE EVENTS MAY BE 
EXPERIENCED, REDUCING THE USABILITY OF LOWER HF CHANNELS.

A MORE DETAILED HF WARNING WILL BE ISSUED AFTER ANTICIPATED GEOMAGNETIC 
STORM ONSET.
-------------------------------------------------------------

IPS Radio and Space Services      | email: asfc at ips.gov.au
PO Box 1386                       | WWW: http://www.ips.gov.au/asfc
Haymarket NSW 1240  AUSTRALIA     | FTP: ftp://ftp.ips.gov.au/users/asfc/ 
tel: +61 2 9213 8010              | fax: +61 2 9213 8060