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Background for JGO: Rosetta dual Langmuir probes (LAP)

Published byPhilippa Søgaard Modified over 6 years ago

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Presentation on theme: "Background for JGO: Rosetta dual Langmuir probes (LAP)"— Presentation transcript:

1 Background for JGO: Rosetta dual Langmuir probes (LAP)

2 LAP characteristics LAP is a part of the Rosetta Plasma Consortium, RPC Two 50 mm spheres (125 g/probe assembly) on booms < 2 m Individual biasing, voltage or current 2 ADCs/probe, kHz 16-bit and 57.8 Hz 20-bit (2.1 W) TM: 2/62/2200 bps Products, 2200 bps: 57.8 Hz probe voltage/current 18.75 kHz snapshot & sweep every 32 s Products, 62 bps: 0.9 Hz probe voltage/current 18.75 kHz snapshot & sweep every few minutes

3 LAP capabilities

4 How to measure plasma density?
Ion spectrometer? Vsc problems at low energy & density Noise integration in low densities Low time resolution Field of view Electron spectrometer? Vsc problems at low energies Natural waves? Wave identification Existence Sounder/impedance? Time resolution Excitation problems Langmuir probes? Probe current/probe characteristic at high densities Density from Vsc at low density Also LF wave E-field if two probes High time resolution

5 Dense plasma: Rosetta sweeps and current at Earth
As on Cassini + waves

6 LAP Earth swingby 1 example
8000 4000 Mode change after c/a

7 Two probes means wake check
3rd Earth swingby, Nov 13, 2009

8 Tenuous plasma: Rosetta LAP Vps at Mars
Rosetta Vps calibrated to MEX plasma density in the solar wind Agrees with Rosetta particle data High time resolution makes boundary studies possible [Edberg et al., Planet. Space Sci., 2009]

9 E-fields? Waves no problem
DC? Perhaps when concentrated to tens of mV/m Possibly also lower fields on occasion…

10 Wake in solar wind: ion density
Rosetta Software Model Results Discussion

11 With photoemission: eph density
Rosetta Software Model Results Discussion

12 With photoemission: potential at probes
Vsc = 10 V Rosetta Software Model Results Discussion Probe 1 blue, probe 2 red Wake signature almost drowned by photoelectrons

13 Inputs from Rosetta A multiprobe LP instrument is very flexible
Ideal boom assembly should offer… Long baseline (for E-field) Biased elements close to probe (for shorting the shortening effect) Symmetry E-field capacity allows ne at high time resolution also in low densities Collaboration in a well working consortium is essential The team building the central unit has a very central position

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