EDP Sciences
Free Access
Issue
A&A
Volume 452, Number 1, June II 2006
Page(s) 347 - 350
Section Planets and planetary systems
DOI https://doi.org/10.1051/0004-6361:20054334


A&A 452, 347-350 (2006)
DOI: 10.1051/0004-6361:20054334

Ultra low frequencies phenomena in Jovian decametric radio emission

O. V. Arkhypov1 and H. O. Rucker2

1  Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Chervonopraporna 4, 61002 Kharkiv, Ukraine
    e-mail: rai@ira.kharkov.ua
2  Space Research Institute, Austrian Academy of Sciences, Schmidlstrasse 6, 8042 Graz, Austria
    e-mail: rucker@oeaw.ac.at

(Received 11 October 2005 / Accepted 24 January 2006)

Abstract
System of periodic peaks is found in the power spectra of ULF flux oscillations of Jovian decametric emission, which is observed at fixed frequencies. This result could be interpreted in terms of an ionospheric Alfvén resonator near Jupiter. Standing Alfvén wave could explain the system of emission bands in the dynamic spectrum of decametric emission. The space period of such bands and the frequency of standing waves have been used to estimate electron number density in the low magnetosphere of Jupiter. The result is consistent with radio occultation data. Hence, the ULF modulation hypothesis appears validated.


Key words: planets and satellites: individual: Jupiter -- magnetic fields -- radiation mechanisms: non-thermal -- plasmas -- waves -- magnetohydrodynamics (MHD)




© ESO 2006

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