Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13a1665s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P13A-1665
Physics
Plasma Physics
[6200] Planetary Sciences: Solar System Objects, [7500] Solar Physics, Astrophysics, And Astronomy, [7800] Space Plasma Physics
Scientific paper
In space science many applications of remote sensing of plasma populations require a high detection efficiency of low energetic neutral particles (energy range 10eV - 1000eV), so called Energetic Neutral Atoms (ENA), because the sources of these ENAs are very faint. This requires advanced detection techniques, and not before long measurements of ENAs were quite impossible due to the limitations onboard of a spacecraft. The reason is neutral particles have to be ionized before they can be analyzed and ionizing techniques, which work fine in a laboratory on earth can be very difficult, if not impossible, to implement in an instrument, which shall work on a satellite. In the mid 1990ies reports about unexpected high yields of negative ions upon scattering of positive and neutral particles from various surfaces finally led to a new type of neutral particle mass spectrometer, which uses the effect of surface ionization and works now successfully on interstellar as well as planetary space missions, such as IMAGE and IBEX (NASA), and the CENA instrument (ESA & ISRO) from the Indian mission to moon Chandrayaan-1. Furthermore, the ENA instrument on Mercury Magnetospheric Orbiter (MMO) from BepiColombo (ESA & JAXA, launch 2014), makes also use of this technique. It took about ten years to find good working so-called Conversion Surfaces (CS) [5] and this report will summarize our tests with possible candidates for conversion surfaces, briefly explain their functionality and display why it is so important to be able to measure ENAs.
Scheer J. A.
Wurz Peter
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