AK-Means Clustering Analysis of the Jovian and Terrestrial Magnetopauses: A Technique to Classify Global Magnetospheric Behavior

Michael R. Collier; Jacob R. Gruesbeck; John E. P. Connerney; Steven P. Joy; George B. Hospodarsky; Aaron Roberts; David G. Sibeck; Edmond C. Roelof

doi:10.1029/2019JE006366

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AK-Means Clustering Analysis of the Jovian and Terrestrial Magnetopauses: A Technique to Classify Global Magnetospheric Behavior

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AK-Means Clustering Analysis of the Jovian and Terrestrial Magnetopauses: A Technique to Classify Global Magnetospheric Behavior

Michael R. Collier, Jacob R. Gruesbeck, John E. P. Connerney, Steven P. Joy, George B. Hospodarsky, Aaron Roberts, David G. Sibeck and Edmond C. Roelof

Journal of geophysical research. Planets, Vol.125(9), e2019JE006366

09/01/2020

DOI: 10.1029/2019JE006366

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Abstract

Previous studies suggested that the Jovian magnetopause position is best characterized as a bimodal distribution indicative of a two-state system. We applied a modifiedk-means clustering analysis to observations of the Jovian and terrestrial magnetopause crossings. Clustering analysis using pre-Juno data shows that the Jovian magnetopause is best described as a two-state system, whereas the terrestrial magnetopause is best described by a single state, indicating that the behavior of the Jovian magnetopause is fundamentally different from that of the terrestrial magnetopause. We also analyzed magnetopause locations detected by the Juno spacecraft and conclude that their distribution is consistent with a two-state system. The origin of the different number of Jovian and terrestrial magnetopause states may be due to the disparate source strengths supplying the two magnetospheres. The Jovian magnetosphere is supplied with about a metric ton of Iogenic heavy ions per second, whereas the terrestrial source, Earth's ionosphere, is two orders of magnitude weaker. A suggestive correlation between Io phase and magnetopause state may be consistent with this proposed link between an internal source and a two-state magnetopause. The possible role of energetic magnetospheric events and Jovian current systems is discussed.

Physical Sciences

Geochemistry & Geophysics

Science & Technology

Details

Title: Subtitle: AK-Means Clustering Analysis of the Jovian and Terrestrial Magnetopauses: A Technique to Classify Global Magnetospheric Behavior
Creators: Michael R. Collier - Goddard Space Flight Center
Jacob R. Gruesbeck - Goddard Space Flight Center
John E. P. Connerney - Goddard Space Flight Center
Steven P. Joy - Planetary Science Institute
George B. Hospodarsky - University of Iowa
Aaron Roberts - Goddard Space Flight Center
David G. Sibeck - Goddard Space Flight Center
Edmond C. Roelof - Johns Hopkins University Applied Physics Laboratory
Resource Type: Journal article
Publication Details: Journal of geophysical research. Planets, Vol.125(9), e2019JE006366
DOI: 10.1029/2019JE006366
ISSN: 2169-9097
eISSN: 2169-9100
Publisher: Amer Geophysical Union
Number of pages: 14
Language: English
Date published: 09/01/2020
Academic Unit: Physics and Astronomy
Record Identifier: 9984455363002771

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