[Ips-dhfpr] IPS Daily HF Prop Report - 09 April 01
rwc
rwc at ips.gov.au
Tue Apr 10 09:22:44 EST 2001
SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 09/2330Z APRIL 2001 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (09 APRIL)
Date T index Conditions
09 Apr 131 Normal
Flares Max Fadeout Freq. Sectors
M7/2B 1534UT probable lower South American/
Atlantic
MUFs:
Equatorial PNG Region:
Mostly near predicted monthly values,
Northern Australian Region:
Mostly near predicted monthly values,
Southern Australian and New Zealand Region:
Depressed by 10 to 20% at the start of the UT day,
Mostly near predicted monthly values afterwards,
Antarctic Region (Casey/Scott Base):
Near predicted monthly values over the UT day.
Predicted Monthly T index for April: 120
2. FORECAST (10 APRIL - 12 APRIL)
Date T index Conditions MUFs
10 Apr 150 Normal Near predicted monthly values
11 Apr 100 Poor about 20% below predicted monthly
values
12 Apr 120 Normal-Fair depressed 10 to 20%/near predicted
monthly values
COMMENT: IPS HF Communications Warning 22 was issued on 9 April
and is current for interval 11-12 April. Anticipated depression
did not eventuate on 9 Apr as the 8 Apr shock was erroneously
assigned to M5 flare/CME rather than the recent X5 flare/CME.
Shortwave fadeouts expected on daylight HF circuits. Enhanced
proton fluxes associated with M7.9 flare from region 9415 on
9 Apr may affect high-latitude HF comms. Depressions are expected
for the 11 and possibly 12 of Apr following the arrival of a
shock associated with the M7.9 flare/CME observed at 1534UT on
9 Apr.
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
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