The mark IV Nancay Radioheliograph

Details The mark IV Nancay Radioheliograph The mark IV Nancay Radioheliograph

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..120..193a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 120, no. 1, 1989, p. 193-204.

Physics

21

Solar Corona, Solar Radio Emission, Spectroheliographs, Calibrating, Circular Polarization, Continuous Radiation, Maps, Solar Radio Bursts

Scientific paper

A multifrequency capability has been added to the north-south array of the Nancay Radioheliograph, providing observations at up to five frequencies between 150 and 450 MHz with time resolution of 0.1 sec or less. The projected position, brightness and dimension of sources in the solar corona can thus be studied as a function of height. Two-dimensional information is obtained at 164 MHz using the east-west and north-south arrays. In addition, the quiescent corona can be mapped in two dimensions at all observed frequencies by earth rotation synthesis. The paper describes the new aspects of the antennae, the receiver frontend, the data acquisition and the calibration procedure. The performances of the instrument are illustrated with multifrequency observations of solar fast-drift bursts, continuum emission and maps of the quiet corona.

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