Surface property effects on Langmuir probes launched on sounding rockets

Computer Science – Sound

Scientific paper

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Techniques, Instrumentation, Ionosphere, Langmuir Probe, Surface Contamination

Scientific paper

A set of two Langmuir probes with different geometries, a cylindrical ring and a sphere, have been flown on three NASA sounding rockets, including one in the Cusp campaign in Spitzbergen in 2002, and two flown in the Joule heating campaign from Poker Flat, Alaska, in 2003. The probes used nearly identical electronics, mechanical design, and sweeping schemes for the spherical probe. However, on the Cusp rocket a titanium nitride sphere was used, while on the Joule rockets, aluminium spheres that were coated with carbon (DAG-213) were used. During the flights, the TiN and carbon swept probes showed significantly different behaviour, both with respect to hysteresis and "overshoot" effects. Whereas the TiN probe shows only little signs of contamination, the carbon coated probe shows large contamination effects. We also report puzzling differences between the ion saturation current collected by the ring and spherical probe on both flights.

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