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The Harang reversal is a prominent feature frequently observed in the electric and … magnetic field patterns in the high-latitude auroral zone and plays an important role … in substorm dynamics. A comprehensive set of instruments, including Super Dual Auroral … Radar Network (SuperDARN)…
A magnetic cloud in the solar wind impinged the Earths magnetosphere on the 7th January … 2005. Episodic enhancements in the coupling of solar wind energy initiated a familiar sequence … of Geospace events including a succession of substorms of increasing intensity throughout the … day.
Space weather impacts on some important modern technologies, particularly … those that depend on satellites. The La Trobe Space Physics Research Group studies the basic physical causes of space … weather phenomena in geospace, the interface between Earth and interplanetary space.
The Super Dual Auroral Radar Network (SuperDARN) is an international network of oblique HF over-the-horizon … radars dedicated to the study of high latitude magnetosphere-ionosphere convection. In scientific terms, they have been … an outstanding success…
This paper outlines work at La Trobe University on the development of a “fully digital” radar for space weather … investigations. The new radar will enhance the existing Tasman International Geospace Environment Radar … (TIGER) that probes beyond the horizon…
Efficient digital phased array beams require a high resolution timing vector. The timing coefficients cause speed bottleneck … in FPGA implementation of such systems in the HF frequency range. Distributed Arithmetic (DA)…
Distributed Arithmetic (DA) is a high speed … multiplication technique used for implementation of digital … filters and signal upconversions. The DA is bit serial word … parallel approach where throughput rate does not depend … on flter length or data ste.
Abstract - Timing resolution plays significant role in … generating digital phased array beams. In this paper we … present a latch method for FPGA implementation of digital … heamforming (DBF') for an ionospheric radar.
FPGA is a potential medium for DSP implementation of direct conversion transmitters and receivers. However analog interface cannot be ruled out since amplification and other tasks are still in the analog domain. In a previous work…
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.
At 08:35 UT on 21 November 2004, the onset of … an interval of substorm activity was captured in the southern … hemisphere by the Far UltraViolet (FUV) instrument on … board the IMAGE spacecraft. This was accompanied by … the onset of Pi2 activity and subsequent magnetic bays…
Super Dual Auroral Radar Network (SuperDARN) HF backscatter radaras scan 16 beam directions over a field of view of ~52°. In the common mode of operation, data is collected using 45-km range gates and 7-s integrations on each beam.
Earthward injections of energetic ions and electrons … mark the onset of magnetospheric substorms. In the inner … magnetosphere (L4), the energetic ions drift westward … and the electrons eastward, thereby enhancing the equatorial … ring current.