The reversal of the rotational modulation rates of the north and south components of Saturn kilometric radiation near equinox - Université Denis Diderot - Paris VII Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2010

The reversal of the rotational modulation rates of the north and south components of Saturn kilometric radiation near equinox

Résumé

It has been known for many years that Saturn emits intense radio emissions at kilometer wavelengths and that this radiation is modulated by the rotation of the planet at a rate that varies slowly on time scales of years. Recently it has been shown that the radio emission consists of two components that have different rotational modulation rates, one emitted from the northern auroral region and the other emitted from the southern auroral region. In this paper we show using radio measurements from the Cassini spacecraft that the rotational modulation rates of the northern and southern components reversed near Saturn's recent equinox, which occurred on 11 August 2009. We show that a similar reversal was also observed by the Ulysses spacecraft near the previous equinox, which occurred on 19 November 1995. The solar control implied by these reversals has important implications on how Saturn's rotation is coupled into the magnetosphere.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2010 - Gurnett - The reversal of the rotational modulation rates of the north and south.pdf (458.75 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03785786 , version 1 (24-09-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Donald A. Gurnett, J. B. Groene, A. M. Persoon, J. Menietti, Sheng-Yi Ye, et al.. The reversal of the rotational modulation rates of the north and south components of Saturn kilometric radiation near equinox. Geophysical Research Letters, 2010, 37, pp.24101. ⟨10.1029/2010GL045796⟩. ⟨hal-03785786⟩
54 Consultations
13 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More