Importance of the electron plasma parameter for excitation of chorus and formation  of magnetic field irregularity in the region of their excitation

Peter Bespalov; Olga Savina; Polina Zharavina

doi:10.12737/stp-103202410

UDC 55

IMPORTANCE OF THE ELECTRON PLASMA PARAMETER FOR EXCITATION OF CHORUS AND FORMATION OF MAGNETIC FIELD IRREGULARITY IN THE REGION OF THEIR EXCITATION Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation

АА Аа

Published in Solar-Terrestrial Physics · Volume 10, Issue 3 · Pages 83–90 · Rubric: 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA

DOI: https://doi.org/10.12737/stp-103202410

Received: 30.03.2024 Accepted: 28.05.2024 Published: 29.09.2024 Language of publication: ENG

Authors

Peter Bespalov

Olga Savina

Polina Zharavina

Peter Bespalov

Academic degree: doctor of physical and mathematical sciences

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics RAS Russian Federation · Nizhny Novgorod

National Research University “Higher School of Economics” Russian Federation · Nizhny Novgorod

Olga Savina

National Research University “Higher School of Econom-ics” Russian Federation · Nizhny Novgorod

Polina Zharavina

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics RAS Russian Federation · Nizhny Novgorod

ABSTRACT

A threshold condition has been established for excitation of VLF electromagnetic radiation with a chorus structure of the dynamic spectrum in the daytime magnetosphere using the BPA (Beam Pulse Amplifier) mechanism for amplifying short noise electromagnetic pulses. The kappa distribution was used as a model function of the electron velocity distribution in the magnetosphere. Calculations performed for this distribution have shown that the threshold for excitation of chorus largely depends on the electron plasma parameter equal to the ratio of gas-kinetic pressure of electrons to magnetic pressure. This pattern is not contradicted by the dependence of the probability of excitation of chorus on the degree of magnetic field irregularity, which we derived from observations made by the Van Allen Probe spacecraft. It is sharp fluctuations in the magnetic field strength near its local minima outside the plasmasphere where the radiation under study can be excited. If there is an irregularity, the probability of detecting chorus is >70 %; and if there is no or very low irregularity, the probability of the absence of any emissions is ~80 %. The results indicate a common reason for the excitation of chorus and the magnetic field irregularity — a small but finite value of the plasma parameter.

KEYWORDS

VLF emissions, chorus, wave-particle interaction, data analysis, middle magnetosphere

Funding

The work of P.A. Bespalov and P.D. Zharavina on Sections 1–2.3, 4 was financially supported by the Russian Science Foundation (Grant No. 20-12-00268); the work of O.N. Savina and P.D. Zharavina on Sections 2.1, 2.3–2.5 was financially supported by the Foundation for the Development of Theoretical Physics and Mathematics "Basis" (Project No. 23-1-1-67-1). The work of P.A. Bespalov on Section 2.2 was performed according to the plan of IPF RAS Government Assignment FFUF-2023-0002

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Editor-in-Chief

Geliy Zherebtsov

solater@iszf.irk.ru

Deputy Editor-in-Chief

Aleksandr Stepanov

stepanov@gaoran.ru

Deputy Editor-in-Chief

Alexander Potapov

potapov@iszf.irk.ru

Executive Secretary of Editorial Board

Natalia Polyushkina

npol@iszf.irk.ru

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GOST

Bespalov P. A., Savina O. N., Zharavina P. D. Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation // Solar-Terrestrial Physics. 2024. no. 3. pp. 83-90. DOI: https://doi.org/10.12737/stp-103202410. (Date of access 23.10.2026).

MLA

Peter Bespalov, Savina O. N., Zharavina P. D.. "Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation." Solar-Terrestrial Physics 10.3 (2024): 83-90. DOI: https://doi.org/10.12737/stp-103202410.

APA

Bespalov P. A., Savina O. N., Zharavina P. D. (2024). Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation. Solar-Terrestrial Physics, 10(3), 83-90. https://doi.org/10.12737/stp-103202410

Chicago

Peter Bespalov, Savina O. N., Zharavina P. D.. "Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation." Solar-Terrestrial Physics 10, no. 3 (2024): 83-90. https://doi.org/10.12737/stp-103202410.

WIKI

{{cite journal | author = Bespalov P. A., Savina O. N., Zharavina P. D. | title = Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation | journal = Solar-Terrestrial Physics | year = 2024 | volume = 10 | issue = 3 | pages = 83-90 | doi = 10.12737/stp-103202410 }}

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IMPORTANCE OF THE ELECTRON PLASMA PARAMETER FOR EXCITATION OF CHORUS AND FORMATION OF MAGNETIC FIELD IRREGULARITY IN THE REGION OF THEIR EXCITATION Importance of the electron plasma parameter for excitation of chorus and formation of magnetic field irregularity in the region of their excitation

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