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A Multi-Purpose, Multi-Channel Radiospectrograph for the Parkes Telescope

Published online by Cambridge University Press:  25 April 2016

J. Lim ,
G. J. Nelson  and
A. E. Vaughan
J. Lim
Affiliation:
School of Mathematics, Physics, Computing, and Electronics, Macquarie University
G. J. Nelson
Affiliation:
CSIRO Division fo Radiophysics, Epping
A. E. Vaughan
Affiliation:
School of Mathematics, Physics, Computing, and Electronics, Macquarie University
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Abstract

The design and scientific applications of a 96-channel filter spectrograph of 1 MHz resolution are presented. The spectrograph is currently under construction and will be installed on the Parkes telescope in 1987-1988. Its main scientific objective is dynamic spectral studies of decimetre- and metre-wavelength bursts from flare stars. However, it will also be used for performing large-scale pulsar surveys, and dynamic spectral observations of interplanetary scintillation of compact sources, interstellar scintillation of compact extragalactic sources, and interesting radio sources in general.

We show that plasma emission generated in the coronae of flare stars should be detectable at metre- and decimetre-wavelengths. We plan to search for fundamental and second-harmonic plasma radiation by observing in two harmonically related bands, 200 to 250 MHz and 400 to 500 MHz. With noise-adding to stabilize receiver gain, the sensitivity (3σ) of each channel of the spectrograph is ∼ 1.5 Jy for a 1-s integration. Previous studies have reported peak flux densities of up to ∼ 35 Jy and ∼ 12 Jy at 240 MHz and 410 MHz respectively for radio bursts from flare stars.

Type
Spectroscopy
Information
Publications of the Astronomical Society of Australia , Volume 7 , Issue 2 , 1987 , pp. 197 - 204
Copyright
Copyright © Astronomical Society of Australia 1987

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