[Ips-dhfpr] IPS Daily HF Prop Report - 17 August 15 issued 2330 UT on 17 Aug 2015
Regional Warning Centre
rwc at ips.gov.au
Tue Aug 18 09:30:46 EST 2015
SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 AUGUST 2015 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (17 AUGUST)
Date T index Conditions
17 Aug 44 Fair
Flares: B class flares
MUFs:
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 45% during local night.
Niue Island Region:
Mostly near predicted monthly values.
Northern Australian Region:
Depressed by 15% during local day.
Depressed by 30% during local night.
Depressed by 30% after local dawn.
Southern Australian Region:
Depressed by 20% during local day.
Depressed by 45% during local night.
Depressed by 35% after local dawn.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Depressed by 20% over the UT day.
PCA Event : No event.
Monthly T index:
Month T index
Jul 60
Aug 80
Sep 78
2. FORECAST (18 AUGUST - 20 AUGUST)
Date T index Conditions MUFs
18 Aug 35 Normal 20 to 40% below predicted monthly
values
19 Aug 45 Normal 15 to 30% below predicted monthly
values
20 Aug 50 Normal Depressed 15%/near predicted
monthly values
COMMENT: Conditions for HF radio wave propagation were depressed
throughout the Australian region during 17 August. The conditions
were more depressed for the mid-latitude stations than the low
latitude stations. For example, the daily T index was 56 for
Cocos Island and 20 for Norfolk Island. The conditions are expected
to be even more depressed during 18 Aug. These depressions (16
to 18 August) are the after-effects of the CME which arrived
at Earth on 15 August. The conditions are expected to slowly
trend back towards mildly depressed conditions relative to the
long-term monthly prediction of T=80.
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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.
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