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SUMMARY:CANCELLED: Statistics and characteristics of mid-latitude travelli
 ng ionospheric disturbances observed by HF radars - Dr Adrian Grocott (Uni
 versity of Leicester)
DTSTART:20120419T130000Z
DTEND:20120419T140000Z
UID:TALK37414@talks.cam.ac.uk
CONTACT:Dr Scott Hosking
DESCRIPTION:CANCELLED: Please note that this talk has been cancelled due t
 o sickness\n\n\nI will present a survey of travelling ionospheric disturba
 nces (TIDs) observed by at mid-latitudes by the SuperDARN HF radars. This 
 study focusses on data from the Falkland Islands radar which was operation
 al between March 2010 and September 2011. Statistics of the radar ground b
 ackscatter\, in which the signatures of TIDs are manifest\, will be presen
 ted along with an analysis of the TID spectral and propagation characteris
 tics. Observed periods were in the range 30 - 60 minutes\, corresponding t
 o frequencies of 0.3 - 0.6 mHz. Wavelengths were generally in the range 25
 0 - 400 km and phase speeds in the range 50 - 200 m/s. These values are wi
 thin the ranges typically associated with medium-scale gravity waves. I wi
 ll discuss these results in terms of hemispheric\, seasonal and diurnal va
 riations\, as well as in terms of their relationship to the local topograp
 hy and large-scale geomagnetic activity.
LOCATION:British Antarctic Survey\, Room 187
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