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| Titel |
Remote sensing of the Io torus plasma ribbon using natural radio occultation of the Jovian radio emissions |
| VerfasserIn |
M. Y. Boudjada, P. H. M. Galopeau, S. Sawas, H. Lammer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 9 ; Nr. 32, no. 9 (2014-09-09), S.1119-1128 |
| Datensatznummer |
250121106
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1119-2014.pdf |
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| Zusammenfassung |
| We study the Jovian hectometric (HOM) emissions recorded by the RPWS (Radio and Plasma Wave
Science) experiment onboard the Cassini spacecraft during its Jupiter flyby.
We analyze the attenuation band associated with the intensity
extinction of HOM radiation. This phenomenon is interpreted as a
refraction effect of the Jovian hectometric emission inside the Io
plasma torus. This attenuation band was regularly observed during periods of
more than 5 months, from the beginning of October 2000 to the end of
March 2001. We estimate for this period the variation of the
electron density versus the central meridian longitude (CML). We
find a clear local time dependence. Hence the electron density was
not higher than 5.0 × 104 cm−3 during 2 months, when the
spacecraft approached the planet on the dayside. In the late
afternoon and evening sectors, the electron density increases to
1.5 × 105 cm−3 and reach a higher value at some specific occasions.
Additionally, we show that ultraviolet and hectometric wavelength
observations have common features related to the morphology of the
Io plasma torus. The maxima of enhancements/attenuations of UV/HOM
observations occur close to the longitudes of the tip of the
magnetic dipole in the southern hemisphere (20° CML) and in
the northern hemisphere (200° CML), respectively. This is a
significant indication about the importance of the Jovian magnetic
field as a physical parameter in the coupling process between
Jupiter and the Io satellite. |
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