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Quantization is a representation of data samples with a certain number of bits per sample after rounding to a suitable … level of precision. Quantization errors in a Digital Signal Processing (DSP) system can be introduced from three … sources; one source is input quantization…
The Tasman International Geospace Environment Radar (TIGER), which is part of the global SuperDARN network, is a dual HF radar system with overlapping footprints designed to map ionospheric motions by detecting ionospheric scatter.
IPS Radio and Space Services, currently operates three four-receiver Canadian Advanced Digital Ionosondes (CADIs), two at mid-latitudes at Canberra and Camden, and the remaining one at Casey station, Antarctica. The deployment of a fourth unit at Macquarie Island is scheduled for this summer.
A numerical procedure is presented for analysis of backscatter spectra recorded by an atmospheric Doppler lidar experiment. The recorded spectra are modelled by an analytic function of five parameters.
Induction magnetometer data recorded at three closely spaced sites (110km) in Antarctica (mlat -75°) have been examined for ionospheric signatures of the outer magnetosphere and cusp/cleft regions. Cross-phase analysis of the 1–10 mHz band…
Photometric intensity measurements of the OH(6-2) band P1(2), P1(3), P1(4) and P1(5) emissions were collected at a four minute repetition rate at Davis station, Antarctica during 1994. These data are being examined to determine the magnitude…
Current research utilises the recently installed Southern Hemisphere Imaging Riometer (SHIRE) located at Australia’s Davis Antarctic station to study riometer signatures associated with cusp-latitude magnetic impulse events (MIE’s) detected in co-located fluxgate magnetometer data.
During the summer season 1997–1998 a GPS Ionospheric Scintillation Monitor (GISM) was installed at Casey station, Antarctica, 66.28°S, 110.24°E, -80.38 invariant latitude. This system is capable of tracking up to 11 GPS satellites at the L1 frequency of 1575.42 MHz.
Digital magnetometer data have been collected from Davis (68.58°S, 78.0°E) since 16 February 1988 and from Casey (66.28°S, 110.5°E) since 17 January 1989. The processing of the variometer data from Casey has been transferred to the Australian Geological Survey Organisation (AGSO)…
A Rayleigh lidar was operated at Kingston, Tasmania on 22 nights between March 1997 and April 1999. During this interval, profiles of scattering ratio obtained from the lidar data indicate that the stratospheric aerosol layer extended up to a maximum altitude of about 34km.
Middle-atmosphere gravity wave spectra of energy against vertical wavenumber are usually assumed to have a log-log slope of -3, based on a number of studies over many years and geographical locations, as well as from theoretical work.
Pc3-4 pulsations observed at high-latitudes have been examined for evidence of magnetic field line resonances. Previous studies have suggested that these pulsations are due to harmonics of the lower frequency Pc5 pulsations.
High-resolution Fabry-Perot spectrometer observations of the OH(62) Q1(1) line, l834.46 nm, were made at Mawson, 67.6ºS 62.9ºE, and Davis, 68.6ºS 78.0ºE, Antarctica, in 1997. The observing program resulted in three sets of continuous OH observations suitable for tidal analysis: July 25…
The so-called ionosonde drift technique of determining ionospheric velocities from angle-of-arrival and Doppler shift measurements is now well established. In the standard digital ionosonde technique, commonly called the drift mode…
Ionospheric Total Electron Content (TEC) determined from July 1991 to June 1995 is examined from southern Australia using Global Positioning System (GPS) satellite data recorded by the Defence Science and Technology Organisation at Salisbury, South Australia.
During 1997 and early 1998 a series of campaigns were undertaken at the Australian Antarctic polar cap station Casey (-80.8o geomagnetic latitude) with the aim of identifying and gaining further understanding of polar patches.
A UMLCAR ( University of Massachusetts Lowell, Centre for Atmospheric Research) Digital Ionosonde (DPS-4) has operated at the Australian Antarctic polar cap station Casey (80.8oS geomagnetic latitude) since early 1993, primarily to study the dynamics of the southern polar cap ionosphere.