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ELECTROMAGNETIC ION CYCLOTRON INSTABILITY IN SPACE PLASMAS

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Title: ELECTROMAGNETIC ION CYCLOTRON INSTABILITY IN SPACE PLASMAS

Authors: M. N. S. Qureshi, S. T. Rizwan , I. Ahmed

Journal: Pakistan Journal of Science (PJS)

HEC Recognition History
Category From To
Y 2024-10-01 2025-12-31
Y 2023-07-01 2024-09-30
Y 2022-07-01 2023-06-30
Y 2020-07-01 2021-06-30
Y 1900-01-01 2005-06-30

Publisher: Advance Educational Institute & Research Centre

Country: Pakistan

Year: 2024

Volume: 76

Issue: 4

Language: English

DOI: 10.57041/vol76iss04pp614-618

Keywords: EMIC waves; Ion distribution function; Non-Maxwellian distributions.

Categories
Geophysics (653) Physics (3755) Space Physics (23) Plasma Physics (55) Astrophysics (111)

Abstract

This study presents observations of ion waves having low-frequencies and their associated ion velocity distribution functions (VDFs) from the Earth’s magnetosphere and solar wind, using the data from Cluster mission. The ion VDFs observed are characterized as non-Maxwellian, comprising a predominant cold component alongside hot tenuous components. We derive the dispersion relation of low-frequency ion waves, by fitting the parameters of observed VDFs, and numerically obtained the instabilitygrowth rate. We further investigate the influence of superthermal particles on the instability.

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