Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...467..353a&link_type=abstract
Astronomy and Astrophysics, Volume 467, Issue 1, May III 2007, pp.353-358
Astronomy and Astrophysics
Astrophysics
5
Planets And Satellites: Individual: Amalthea, Planets And Satellites: Individual: Jupiter, Scattering, Plasmas, Magnetic Fields, Radiation Mechanisms: Non-Thermal
Scientific paper
Most modulation lanes in dynamic spectra of Jovian decametric emission (DAM) are formed by radiation scattering on field-aligned inhomogeneities in the Io plasma torus. The positions and frequency drift of hundreds of lanes have been measured on the DAM spectra from UFRO archives. A special 3D algorithm is used for localization of field-aligned magnetospheric inhomogeneities by the frequency drift of modulation lanes. It is found that some lanes are formed near the magnetic shell of the satellite Amalthea mainly at longitudes of 123°≤λ_III≤140° (north) and 284°≤λ_III≤305° (south). These disturbances coincide with regions of plasma compression by the rotating magnetic field of Jupiter. Such modulations are found at other longitudes too (189° to 236°) with higher sensitivity. Amalthea's plasma torus could be another argument for the ice nature of the satellite, which has a density less than that of water.
Arkhypov Oleksiy V.
Rucker Helmet O.
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