2.2.6 spase://CDPP/Instrument/AMDA/Rosetta/LAP LAP Langmuir Probe 2009-05-20T21:10:13Z The ESA Rosetta mission to comet 67P/Churyumov-Gerasimenko carried a small but comprehensive set of plasma instruments known as the Rosetta Plasma Consortium (RPC), monitoring the cometary plasma from arrival in August 2014 to end of mission in September 2016. Among the RPC instruments was the Langmuir probe instrument LAP, with chief mission to measure: * Plasma density, ne * Spacecraft potential, Vsc * Electron temperature, Te * Electric field, E * Ion flow speed, ui * Photoemission current, Iph * Wave activity The LAP sensors are two spherical probes, 5 cm in diameter, known as LAP1 and LAP2, one on each of the two booms protruding a few meters from the s/c body. The primary parameters actually measured by the instrument is the current flowing to (or the voltage of) the probes when some bias voltage (or bias current) is applied to it, which are the data transmitted to ground. From these data the parameters above have been derived, for some products also with use of data from RPC-MIP. Do not expect all parameters to be available at any given time. spase://CDPP/Person/Anders.Eriksson PrincipalInvestigator LangmuirProbe spase://CDPP/Observatory/AMDA/Rosetta