Tether radiation in Juno-type and circular-equatorial Jovian orbits

Sánchez-Torres, Antonio and Sanmartín Losada, Juan Ramón (2011). Tether radiation in Juno-type and circular-equatorial Jovian orbits. "Journal of geophysical research", v. 116 ; p. 12226. ISSN 0148-0227. https://doi.org/10.1029/2011JA016951..

Description

Title: Tether radiation in Juno-type and circular-equatorial Jovian orbits
Author/s:
  • Sánchez-Torres, Antonio
  • Sanmartín Losada, Juan Ramón
Item Type: Article
Título de Revista/Publicación: Journal of geophysical research
Date: 2011
ISSN: 0148-0227
Volume: 116
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Wave radiation by a conductor carrying a steady current in both a polar, highly eccentric, low perijove orbit, as in NASA's planned Juno mission, and an equatorial low Jovian orbit (LJO) mission below the intense radiation belts, is considered. Both missions will need electric power generation for scientific instruments and communication systems. Tethers generate power more efficiently than solar panels or radioisotope power systems (RPS). The radiation impedance is required to determine the current in the overall tether circuit. In a cold plasma model, radiation occurs mainly in the Alfven and fast magnetosonic modes, exhibiting a large refraction index. The radiation impedance of insulated tethers is determined for both modes and either mission. Unlike the Earth ionospheric case, the low-density, highly magnetized Jovian plasma makes the electron gyrofrequency much larger than the plasma frequency; this substantially modifies the power spectrum for either mode by increasing the Alfven velocity. Finally, an estimation of the radiation impedance of bare tethers is considered. In LJO, a spacecraft orbiting in a slow downward spiral under the radiation belts would allow determining magnetic field structure and atmospheric composition for understanding the formation, evolution, and structure of Jupiter. Additionally, if the cathodic contactor is switched off, a tether floats electrically, allowing e-beam emission that generate auroras. On/off switching produces bias/current pulses and signal emission, which might be used for Jovian plasma diagnostics.

More information

Item ID: 23245
DC Identifier: http://oa.upm.es/23245/
OAI Identifier: oai:oa.upm.es:23245
DOI: 10.1029/2011JA016951.
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 26 Mar 2014 12:53
Last Modified: 05 Dec 2016 07:59
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