Performance and simulated moment uncertainties of an ion spectrometer with asymmetric 2 pi field of view for ion measurements in space

Su B.; Kong L. G.; Zhang A. B.Klecker B.Escoubet C. P.Kataria D. O.Dai L.

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Performance and simulated moment uncertainties of an ion spectrometer with asymmetric 2 pi field of view for ion measurements in space

机译：Performance and simulated moment uncertainties of an ion spectrometer with asymmetric 2 pi field of view for ion measurements in space

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Space plasma instruments provide 3D particle velocity distribution functions. Because of telemetry limitations, these cannot be transmitted in high time resolution and the plasma needs to be characterized by moments of the velocity distribution function. These moment uncertainties have vital effects on the reliability and accuracy of onboard plasma moments. We assess the measurement accuracy for magnetosheath and solar wind ions using an ion spectrometer with an asymmetric field of view designed for the all-sky measurement of low-energy ions in the magnetosheath and solar wind. We focus on moment uncertainties for the ideal spectrometer, not considering the background counts, which may have considerable effects on the uncertainties in real life. To obtain number density, bulk velocity, and temperature, different orders of moments are integrated assuming a Maxwellian velocity distribution. Based on the design specifications, we use simulations to estimate systematic and random errors for typical plasma conditions. We find that the spectrometer resolution is adequate for determining the density of solar wind (similar to 7% error) and magnetosheath ions (similar to 4% error). The resolution is also adequate for determining the temperature of solar wind (similar to 10% error) and magnetosheath ions (similar to 2% error). For high speed flows with a bulk velocity of 750 km/s and a temperature of 20 eV, the maximum density and temperature errors become 9% and 7%, respectively. The bulk velocity errors are less than 2% for all cases. The contributions of heavy ions to the systematic errors are less than 5% for magnetosheath ions and less than 8% for solar wind ions.

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《Review of Scientific Instruments》 |2021年第2期|024501-1-024501-13|共13页
作者
Su B.; Kong L. G.; Zhang A. B.Klecker B.Escoubet C. P.Kataria D. O.Dai L.;
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Univ Coll London, Mullard Space Sci Lab, Holmbury RH5 6NT, Surrey, England;

Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China;

Max Planck Inst Extraterr Phys, D-85748 Garching, GermanyEuropean Space Agcy, European Space Res & Technol Ctr, NL-2201AZ Noordwijk, Netherlands;

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Performance and simulated moment uncertainties of an ion spectrometer with asymmetric 2 pi field of view for ion measurements in space

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