Effects of noise on the accuracy of plasma bulk parameters derived from velocity moments of in-situ observations
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Published:2023-01
Issue:1
Volume:368
Page:
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ISSN:0004-640X
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Container-title:Astrophysics and Space Science
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language:en
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Short-container-title:Astrophys Space Sci
Author:
Nicolaou Georgios
Abstract
AbstractWe expose and quantify the inaccuracies of plasma bulk parameters derived from the calculation of velocity moments of noisyin-situplasma observations. First, we simulate typical solar wind proton plasma observations, obtained by a typical top-hat electrostatic analyzer instrument. We add background noise to the simulated observations and analyze them by applying standard methods to derive the plasma density, speed, and temperature. We then compare the analysis results with the parameters we use to simulate the observations in the first place, in order to quantify the inaccuracies in the calculated plasma parameters as functions of the noise level in the observations. We find that even noise levels that are smaller than 1% of the signal peak, lead to significant inaccuracies in some plasma parameters. The plasma temperature suffers the biggest inaccuracies and the plasma speed the smallest. Our results highlight the importance of removing noise from observations when calculating the moments of the constructed plasma distributions. We finally, evaluate one simple method to remove uniform background noise automatically from measurements, which is useful for future on-board analyses.
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Astronomy and Astrophysics
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