Essays about: "Langmuir probe"

Showing result 11 - 15 of 22 essays containing the words Langmuir probe.

  1. 11. Numerical simulation of Rosetta Langmuir Probe

    University essay from Rymd- och plasmafysik

    Author : Fredrik Johansson; [2013]
    Keywords : SPIS; Rosetta; Langmuir Probe; Simulation; IRF;

    Abstract : By modelling and simulating the ESA spacecraft Rosetta in a plasma with solar wind parameters, and simultaneously simulating a particle detection experiment of Langmuir probe voltage sweep type using the ESA open source software SPIS Science, we investigate the features of Rosetta’s envi- ronment in the solar wind and the e↵ect of photoemission from the space- craft on the measurements made by the Langmuir Probe instrument on board Rosetta. For a 10 V positively charged spacecraft and Maxwellian distributed photoelectron emission with photoelectron temperature, Tf = 2 eV in a plasma of typical 1 AU solar wind parameters: ne = 5 ⇥ 106 m3, vSW = 4 ⇥ 105 m/s, Te = 12 eV, Tion = 5 eV, we detect a floating potential of 6. READ MORE

  3. 12. Plasma Structures at the Enceladus Plume

    University essay from Institutet för rymdfysik, Uppsalaavdelningen; Rymd- och plasmafysik

    Author : Ilka A.D. Engelhardt; [2013]
    Keywords : Enceladus; Plasma Density; Fine Structure;

    Abstract : Cassini-RPWS high resolution (20 Hz) Langmuir probe data was analyzed to find the source of fast variations in the electron density especially in the Enceladus plume region. The spatial scale on the variations is between 1 and 10 km in size. READ MORE

  4. 13. Rosetta Langmuir probe performance

    University essay from Institutionen för fysik och astronomi

    Author : Fredrik Johansson; [2013]
    Keywords : Rosetta; SPIS; SPIS 5; Langmuir; Probe; Plasma; Probe sweep; Potential; Simulation; PIC; IRF; Swedish Institute of Space Physics; ESA;

    Abstract : Several Langmuir probe voltage sweeps by a model of the ESA spacecraft Rosetta was simulated in a plasma with solar wind parameters using the ESA open source software SPIS 5. The simulations were carried out to in- vestigate the features of the spacecraft’s environment in the solar wind and the effect of photoemission from the spacecraft surface on the measurements made by the Langmuir probes on board Rosetta. READ MORE

  5. 14. Noise sources in the electric field antenna on the ESA JUICE satellite

    University essay from

    Author : Elias Odelstad; [2013]
    Keywords : JUICE; noise; quasi-thermal noise; QTN; Nyquist noise; shot noise; Langmuir probes; electric field probes;

    Abstract : The noise in the Langmuir Probe and Plasma Wave Instrument (LP-PWI) on board ESA:s future Jupiter satellite JUICE (Jupiter ICy Moons Explorer) was investigated. Thermal Johnson-Nyquist noise and shot noise, caused by fluctuations in the probe-plasma currents, were combined with the quasi-thermal noise (QTN) due to thermal fluctuations in the electric field in the plasma, using a small signal equivalent circuit model. READ MORE

  6. 15. Noise sources in the electric field antenna on the ESA JUICE satellite

    University essay from Institutet för rymdfysik, Uppsalaavdelningen; Rymd- och plasmafysik

    Author : Elias Odelstad; [2013]
    Keywords : JUICE; noise; quasi-thermal noise; QTN; Nyquist noise; shot noise; Langmuir probes; electric field probes;

    Abstract : The noise in the Langmuir Probe and Plasma Wave Instrument (LP-PWI) on board ESA:s future Jupiter satellite JUICE (Jupiter ICy Moons Explorer) was investigated. Thermal Johnson-Nyquist noise and shot noise, caused by fluctuations in the probe-plasma currents, were combined with the quasi-thermal noise (QTN) due to thermal fluctuations in the electric field in the plasma, using a small signal equivalent circuit model. READ MORE