Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..322s&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Physics
Scientific paper
An electrodynamic tether mission at Jupiter, starting with capturing the spacecraft into a retrograde, equatorial, highly elliptical orbit at low perijove, is discussed. The tether would be a thin tape, 50 kilometers long and 0.05 mm thick, with a 12 minutes spin period. In a first phase, repeated application of propellantless Lorentz drag on the tape would progressively lower the apojove at near constant perijove. Under 20 perijove passes, with a total duration of 3 months and an accumulated radiation dose less than 1 Mrad Si behind 10 mm of Al shielding, would be required to take the spacecraft to a circular orbit at about 1.3 the Jupiter radius, below the Jovian radiation belts. Energy continuously generated at a load plugged in the tether circuit would be used for science data acquisition and transmission. In a second phase, once the spacecraft in circular orbit, current would be controlled to allow for a slow spiralling of the orbit over a period of several months, for surface and subsurface exploration of Jupiter, and magnetic and gravimetric measurements. Thermal and bowing/tensile-stress constraints on the tether operations are discussed. The effect of the Lorentz torque on the spin is also analyzed.
Bombardelli Claudio
Charro Mario
Evans Robert W.
Garrett Henry Berry
Lorenzini Enrico C.
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