Multifrequency analysis of a decametric storm observed at Voyager 1 and ground-based observatories

Details Multifrequency analysis of a decametric storm observed at Voyager 1 and ground-based observatories Multifrequency analysis of a decametric storm observed at Voyager 1 and ground-based observatories

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..115m&link_type=abstract

(Chapman Conference on Plasma Waves and Instabilities in Magnetospheres and at Comets, Sendai, Japan, Oct. 12-16, 1987) Journal

Astronomy and Astrophysics

Astronomy

3

Decametric Waves, Io, Jupiter (Planet), Noise Storms, Planetary Radiation, Radio Sources (Astronomy), Background Noise, Corotation, Ground Stations, Jupiter Atmosphere, Planetary Magnetospheres

Scientific paper

Observations of a Jovian decametric non-Io-A noise storm made from Voyager 1, the University of Florida Radio Observatory, the University of Texas Radio Astronomy Observatory, and the Jupiter station at Goddard Space Flight Center at frequencies of 26.3, 22.2, 20.0, and 18.0 MHz were found to be correlated. The activity observed at the ground stations occurred 68 min after the corresponding activity at Voyager 1. After correction is made for propagation time differences, this delay is reduced to 34 min. It is demonstrated that at each frequency the envelope of the individual-event beams occurring during the storm (some or all of which are associated with dynamic spectral arcs) is a quasi-constant structure that corotates with the inner Jovian magnetosphere, and that the width of this envelope beam is frequency dependent. The width increases as frequency is decreased, mainly because of the change in position of the trailing-edge beam boundary. Evidence for a relatively slow temporal change in beam geometry is also presented.

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