Models for magnetospheric mass density and average ion mass including radial dependence

Richard E. Denton; Kazue Takahashi; Kyungguk Min; David P Hartley; Yukitoshi Nishimura; Matthew C. Digman

doi:10.3389/fspas.2022.1049684

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Models for magnetospheric mass density and average ion mass including radial dependence

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Models for magnetospheric mass density and average ion mass including radial dependence

Richard E. Denton, Kazue Takahashi, Kyungguk Min, David P Hartley, Yukitoshi Nishimura and Matthew C. Digman

Frontiers in astronomy and space sciences, Vol.9, 1049684

12/16/2022

DOI: 10.3389/fspas.2022.1049684

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Abstract

Analytical models for magnetospheric mass density, rho (m), and average ion mass, M, were created from a database of rho (m) and electron density, n (e), values from six spacecraft missions by making use of the Eureqa nonlinear genetic regression algorithm. All values of rho (m) were determined from Alfven frequencies, and the values of n (e) were determined from plasma wave or spacecraft potential data. Models of varying complexity are listed. The most complex models appearing in this paper are capable of modeling rho (m) within a factor of 1.81, and M within a factor of 1.34 if n (e) is used as an input parameter, or within a factor of 1.45 if n (e) is not used. The most important parameters for modeling rho (m) are L, the solar EUV index F10.7, magnetic local time, MLT, the geomagnetic activity index Kp, and the solar wind dynamic pressure, Pdyn. The very simplest model for M depends on Kp. In more complex models for M including n (e), the most important parameters are n (e) with L, F10.7, and Pdyn or Kp. In more complex models for M not including n (e), the most important parameters are Kp, MLT, F10.7, L, and the auroral electrojet index, AE. Explanations for most of the dependencies are given. We also demonstrate the danger of calculating spatial dependence without taking account of different conditions sampled in different regions. Here we avoid that problem by using multivariant models.

Physical Sciences

Astronomy & Astrophysics

Science & Technology

Details

Title: Subtitle: Models for magnetospheric mass density and average ion mass including radial dependence
Creators: Richard E. Denton - Dartmouth College
Kazue Takahashi - Johns Hopkins University Applied Physics Laboratory
Kyungguk Min - Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon, South Korea
David P Hartley - University of Iowa
Yukitoshi Nishimura - Boston University
Matthew C. Digman - Montana State University
Resource Type: Journal article
Publication Details: Frontiers in astronomy and space sciences, Vol.9, 1049684
DOI: 10.3389/fspas.2022.1049684
ISSN: 2296-987X
eISSN: 2296-987X
Publisher: Frontiers Media Sa
Number of pages: 19
Grant note: DOI: 10.13039/100000104, name: National Aeronautics and Space Administration; DOI: 10.13039/100000104, name: National Aeronautics and Space Administration; DOI: 10.13039/501100003725, name: National Research Foundation of Korea
Language: English
Date published: 12/16/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984548669202771

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