Differential charging of electrodes on moving balloon gondolas and DC electric field estimation by the Huygens Probe in Titan's atmosphere.

Details Differential charging of electrodes on moving balloon gondolas and DC electric field estimation by the Huygens Probe in Titan's atmosphere. Differential charging of electrodes on moving balloon gondolas and DC electric field estimation by the Huygens Probe in Titan's atmosphere.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmae53a..03h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #AE53A-03

Physics

7855 Spacecraft Sheaths, Wakes, Charging, 5719 Interactions With Particles And Fields, 5794 Instruments And Techniques, 6280 Saturnian Satellites, 2194 Instruments And Techniques

Scientific paper

In January 2005 the HUYGENS probe will explore the atmosphere of Titan. In particular the on board HASI-PWA instrument is dedicated to the atmospheric electricity. The conductive probe body will move down under parachute from ~160 km to the ground with boom held electrodes to measure the ionic polar conductivities and DC electric field. From 1995 to now, several balloon tests with 1:1 probe mockups were performed in the terrestrial atmosphere that showed correct measurements for the ionic conductivities but non-expected behavior for the electric field measurement. Obviously differential charging between the conductive body and the electrodes occurred, with a maximum near the tropopause. The charging effects are clearly related to the probe velocity and to the ambient DC electric field. The pending question is to deduce precisely the DC field from the electric potential measurements. We present, compare and discuss the experimental results of these balloon experiments with regards to the current theoretical investigations and in view of the forthcoming entry of HUYGENS in the atmosphere of Titan.

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