[Ips-dhfpr] IPS Daily HF Prop Report - 27 January 09
rwc
rwc at ips.gov.au
Wed Jan 28 10:07:13 EST 2009
SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 27/2330Z JANUARY 2009 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (27 JANUARY)
Date T index Conditions
27 Jan -16 Normal-fair
Flares: none.
MUFs:
Equatorial PNG/Niue Region:
Depressed by 20% during local day,
Depressed by 20% during local night.
Northern Australian Region:
Depressed by 30% 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 (28 JANUARY - 30 JANUARY)
Date T index Conditions MUFs
28 Jan -20 Normal near predicted monthly values/depressed
10 to 20%
29 Jan -20 Normal near predicted monthly values/depressed
10 to 20%
30 Jan -10 Normal near predicted monthly values/depressed
0 to 10%
COMMENT: Intermittent sporadic-E events again observed throughout
the region, often strong blanketing Es that obscured the F-region.
The Es ocurrence appears a little less then previous days. Spread
F was also widely observed. The slight F region enhancement caused
by the Unsettled-Active geomagnetic conditions from the CIR on
the 25th died away during this UT day and MUFs were depressed
in all latitudes, particularly during the local day. At mid-latitudes
a mild post-dusk enhancement was observed at most stations but
this only brought the foF2 to monthly average levels. There were
more significant local depressions and enhancements in the equatorial
region, despite the lack of strong geomagnetic activity. These
are likely caused by high altitude (300km) thermospheric winds
and a strong enhancement with a near doubling of foF2 was seen
to propagate west from Niue (02UT) through Darwin (03UT) to Cocos
Is (05UT). Continuing Sporadic-E events seem likely from Equatorial
to S.Aus/NZ regions. Expect MUFs to continue below monthly averages
due to lack of sunspot activity for a couple of days. The next
coronal hole may slightly alleviate this in three or four days
time.
----------------------------------------------------------
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
IMPORTANT: This e-mail, including any attachments, may contain,
confidential or copyright information. The views expressed in
this message are those of the individual sender, unless
specifically stated to be the views of IPS. If you are not
the intended recipient, please contact the sender immediately
and delete all copies of this e-mail and attachments.
Occasionally IPS sends email promoting IPS products and
services to its mailing list customers. If you do not wish to
receive this promotional material please email
no-spam at ips.gov.au with the subject header:UNSUBSCRIBE"
More information about the ips-dhfpr
mailing list