[Ips-whfpr] IPS Weekly Prop. Report (17 December 08)
rwc
rwc at ips.gov.au
Wed Dec 17 13:08:13 EST 2008
SUBJ: IPS WEEKLY HF PROPAGATION REPORT
ISSUED AT 17/0200Z DECEMBER 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (10 DECEMBER - 16 DECEMBER)
Date T index Conditions
10 Dec -40 Normal-fair
MUFS:
Equatorial PNG/Niue Region:
At Vanimo, 15-30% depressed, near predicted 15-23 UT.
At Niue, 15-40% depressed, near predicted 03-06 UT and
night spread F.
Northern Australian Region:
Near predicted monthly values to 30% depressed.
Southern Australian and New Zealand Region:
Near predicted monthly values to 45% depressed at
times. Depressions greater at the lower latitudes.
Sporadic E observed at Christchurch much of the time
and Norfolk Is. 00-04 UT.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values. Sporadic E at Macquarie
Is. observed 13-16 UT.
11 Dec -25 Normal-fair
MUFS:
Equatorial PNG/Niue Region:
At Vanimo, frequencies mostly near predicted 00-14 UT
with depressions to 50% at times thereafter. At Niue,
frequencies were mostly 15-40% depressed with daytime
sporadic E and night time spread F observed.
Northern Australian Region:
At Darwin and Townsville, frequencies were depressed
to 30% 00-05 UT then mostly near predicted monthly
values. At Cocos Is., frequencies were near predicted
to 13 UT then mostly 30% depressed.
Southern Australian and New Zealand Region:
Frequencies were near predicted monthly values to 25%
depressed. Sporadic E observed at most stations.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values. Frequencies at
Macquarie Is. were near predicted with depressions to
30% 12-17 UT.
12 Dec -32 Normal
MUFS:
Equatorial PNG/Niue Region:
Near predicted monthly values during local day,
Depressed by 30% during local night.
Depressed by 25% after local dawn.
Northern Australian Region:
Near predicted monthly values during local day,
Depressed by 25% during local night.
Southern Australian and New Zealand Region:
Near predicted monthly values.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values over the UT day.
13 Dec -18 Normal
MUFS:
Equatorial PNG/Niue Region:
Near predicted monthly values during local day,
Depressed by 25% during local night.
Northern Australian Region:
Enhanced by 15% during local day,
Near predicted monthly values during local night.
Southern Australian and New Zealand Region:
Mostly near predicted monthly values,
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values over the UT day.
14 Dec -22 Normal-fair
MUFS:
Equatorial PNG/Niue Region:
Near predicted monthly values at Vanimo. At Niue,
frequencies were 15-30% depressed with depressions to
40% 12-15 UT.
Northern Australian Region:
Near predicted monthly values with depressions to 30%
at Townsville 09-14 UT and to 40% at Darwin 16-20 UT.
At Cocos Is. frequencies were near predicted to 30%
depressed.
Southern Australian and New Zealand Region:
At Brisbane and Norfolk Is., frequencies were 15-35%
depressed until 17 UT then near predicted. At
Learmonth, frequencies were near predicted until 13 UT
then depressed to 40%. At other stations, frequencies
were near predicted to 20% depressed.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values. Depressions to 40%
observed at Macquarie Is. 12-16 UT.
15 Dec -36 Normal-fair
MUFS:
Equatorial PNG/Niue Region:
Near predicted monthly values during local day,
Depressed by 25% during local night.
Northern Australian Region:
Near predicted monthly values during local day,
Depressed by 15% during local night.
Southern Australian and New Zealand Region:
Depressed by 15% during local day,
Depressed by 20% during local night.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values over the UT day.
16 Dec -44 Normal-fair
MUFS:
Equatorial PNG/Niue Region:
Depressed by 25% during local day,
Depressed by 40% during local night.
Northern Australian Region:
Near predicted monthly values during local day,
Depressed by 40% during local night.
Southern Australian and New Zealand Region:
Depressed by 20% during local day,
Depressed by 20% during local night.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values over the UT day.
Predicted Monthly T index for December: 4
2. FORECAST (17 DECEMBER - 23 DECEMBER)
MUFS: Depressed by 10%-30% for low to mid latitudes for
this forecast period. Disturbed periods expected for high
latitudes with otherwise normal conditions.
Propagation conditions: Mostly normal with some isolated
disturbed periods. No SWFs.
T index: 4
COMMENT: IPS HF Communications Warning 25 was issued on
17 December and is current for interval 17-19 December.
3. OUTLOOK (24 DECEMBER - 23 JANUARY)
Degraded HF propagation conditions possible:
No signficant degraded periods expected.
PLEASE NOTE:
Space weather conditions can frequently be determined by short
timescale events that cannot be forecast a week in advance,
particularly at solar maximum.
For an explanation of some of the terms in this report, go to
http://www.ips.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.
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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