[Ips-hf-warning] IPS HF COMMS WARNING
rwc at ips.gov.au
Wed Oct 29 09:28:23 EST 2003
SUBJ: IPS PRELIMINARY HF RADIO COMMUNICATIONS WARNING 03/78
ISSUED AT 28/2219Z OCTOBER 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.
A MAJOR FLARE WITH BRIGHT/FAST SOLAR MASS EJECTION WAS
HF CONDITIONS ARE EXPECTED TO BE INITIALLY GOOD FOR
FIRST HALF UT DAY ON 29 OCT. DEGRADED/DEPRESSED HF
PROPAGATION CONDITIONS EXPECTED FROM SECOND HALF 29
OCTOBER AND STRONG DEPRESSION LIKELY AFTER LOCAL
DAWN 30 OCTOBER 2003.
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
A MORE DETAILED HF WARNING WILL FOLLOW IF DEPRESSIONS EVENTUATE.
HIGH LATITUDE/POLAR COMMUNICATORS:
TRANSPOLAR HF CIRCUITS CURRENTLY UNUSABLE DUE TO INTENSE SOLAR
PROTON EVENT FOLLOWING MAJOR FLARE, CAUSING POLAR CAP
Note that Preliminary Warning number 77 is a fail to eventuate,
due to weaker than expected geomagnetic activity overnight,
following weak shock arrivals. However, this more recent solar event
was very large and clearly Earth directed and therefore
has a much greater chance of causing an ionospheric storm.
IPS Radio and Space Services | email: asfc at ips.gov.au
PO Box 1386 | WWW: http://www.ips.gov.au
Haymarket NSW 1240 AUSTRALIA | FTP: ftp://ftp.ips.gov.au
tel: +61 2 9213 8010 | fax: +61 2 9213 8060
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