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Stuttgart 2012 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 5: Planeten und kleine Körper I

EP 5.8: Vortrag

Mittwoch, 14. März 2012, 15:45–16:00, V55.02

Modeling the interstellar dust flow in the solar system: application to the JUICE and Galileo missions — •Veerle Sterken1,2, Nicolas Altobelli3, Sascha Kempf4, Ralf Srama5, and Eberhard Grün1,41MPIK, Heidelberg, Germany — 2IGEP, TU Braunschweig, Germany — 3ESA, Madrid, Spain — 4LASP, University of Colorado, Boulder, US — 5IRS, Universität Stuttgart, Germany

The interstellar dust (ISD) flow through the solar system has been modeled and studied. Solar gravity, solar radiation pressure forces as well as Lorentz forces due to the motion of the charged dust grains through the interplanetary magnetic field, change the local ISD flux in the inner solar system. These changes are correlated to the solar cycle because of the time-varying interplanetary magnetic field. The local relative ISD fluxes and velocities at Jupiter are calculated for the JUICE and Galileo missions. We conclude that the last part of the JUICE cruise phase lends itself perfectly for some extra add-on science at limited extra cost in terms of spacecraft resources. Both the location and the time are optimal when JUICE arrives at Jupiter in 2029-2030: Jupiter is then moving into the stream of ISD grains (higher flux) and is almost at the beta-cone for beta = 3, allowing most of the carbon grains to reach JUICE. Also the grains are focused due to the focusing phase of the solar cycle resulting in up to 10 times higher relative fluxes. Galileo measurements happened largely during the defocusing phase of the solar cycle and while Jupiter was downstream of the Sun, and thus for large part of the mission Galileo was inside of most betacones.

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