[Ips-dhfpr] IPS Daily HF Prop Report - 29 January 09
rwc
rwc at ips.gov.au
Fri Jan 30 10:42:39 EST 2009
SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 29/2330Z JANUARY 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (29 JANUARY)
Date T index Conditions
29 Jan -11 Normal-fair
Flares: none.
MUFs:
Equatorial PNG/Niue Region:
Depressed by 15% during local day,
Depressed by 15% during local night.
Northern Australian Region:
Depressed by 20% during local day,
Near predicted monthly values 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.
PCA Event : No event.
Predicted Monthly T index for January: 6
2. FORECAST (30 JANUARY - 01 FEBRUARY)
Date T index Conditions MUFs
30 Jan -5 Normal near predicted monthly values/depressed
0 to 10%
31 Jan -10 Normal near predicted monthly values/depressed
5 to 15%
01 Feb -10 Normal near predicted monthly values/depressed
5 to 20%
COMMENT: Sporadic-E events again observed throughout the region,
particularly strong blanketing Es that obscured the F-region,
along the Australian eastern seaboard (Brisbane, Sydney, Canberra,
Norfolk Is sondes) during the night and continuing into this
morning. MUFs were again depressed at mid and equatorial latitudes,
particularly during the local day. At mid-latitudes a short post-dusk
enhancement was observed again, more pronounced at northern stations,
and this took the foF2 to above monthly average levels at several
stations. See Current foF2 plots webpage under Australiasia-HF
Conditions. There were again significant local depressions and
enhancements in the equatorial region, despite the lack of any
geomagnetic activity. Strong enhancements during the local morning
but depressions during local noon. These are likely caused by
high altitude (300km) thermospheric winds. Continuing Sporadic-E
events seem likely. Expect MUFs to continue below monthly averages
due to lack of sunspot activity. A coronal hole solar wind speed
increase has taken effect but the geomagnetic field and ionosphere
are yet to respond. Possible moderate geomagnetic activity during
the 30th Jan UT day could raise MUFs closer to predicted monthly
averages.
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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.
IPS Radio and Space Services email: asfc at ips.gov.au
PO Box 1386 WWW: http://www.ips.gov.au
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tel: +61 2 9213 8010 fax: +61 2 9213 8060
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