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Astron. Astrophys. 354, 1101-1109 (2000)

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Statistical studies of jovian decameter emissions observed during the same period by Nançay Decameter Array (France) and WAVES experiment aboard Wind spacecraft

A. Aubier 1,2, M.Y. Boudjada 3, Ph. Moreau 2, P.H.M. Galopeau 4, A. Lecacheux 2 and H.O. Rucker 3

1 Université de Versailles-Saint Quentin, 78035 Versailles Cedex, France
2 UMR 8644-CNRS Observatoire de Paris-Meudon, 92180 Meudon, France
3 Space Research Institute, 8010 Graz, Austria
4 CETP, 78140 Velizy, France

Received 13 October 1999 / Accepted 24 December 1999

Abstract

Occurrence probabilities and polarization characteristics of the decameter jovian emissions (DAM) have been analysed by combined ground and space observations. We use the data observed in the same period by the Nançay decameter array (France) and the WAVES experiment on board Wind spacecraft. The ground observations cover the frequency range 10 to 40 MHz when the space experiment records the lower part of the spectrum from 1 MHz up to 13.8 MHz. Different observation conditions lead to a better description of the jovian decameter emissions where the ground-based and space observations are performed with distinct type of antenna and complementary receivers.

The combination of Nançay decameter observations and the WAVES/Wind data allow to analyse in terms of occurrence probability and polarization more than 200 events. After midnight and between 02:00 UT and 04:30 UT, 50[FORMULA] of these events are simultaneously observed from the ground and in space. In the Io-phase CML diagram, the ground observations are mainly related to Io-A and Io-B sources with right-hand polarizations and Io-C and Io-D sources with left-hand polarizations. For WAVES/Wind observations, the occurrences are related to Io-controlled (Io-C and Io-D) and non-Io-controlled emissions where we note the quasi-absence of Io-A and Io-B sources. The main differences in the occurrence probability between ground and space observations are interpreted as an effect of Earth ionosphere and receiver frequency coverages.

Key words: planets and satellites: individual: Jupiter – polarization – radio continuum: solar system

Send offprint requests to: M.Y. Boudjada (mohammed.boudjada@oeaw.ac.at)

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© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000
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