A Model of the Subpacket Structure of Rising Tone Chorus Emissions

Miroslav Hanzelka; Ondrej Santolik; Yoshiharu Omura; Ivana Kolmasova; Craig A. Kletzing

doi:10.1029/2020JA028094

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A Model of the Subpacket Structure of Rising Tone Chorus Emissions

Journal article

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A Model of the Subpacket Structure of Rising Tone Chorus Emissions

Miroslav Hanzelka, Ondrej Santolik, Yoshiharu Omura, Ivana Kolmasova and Craig A. Kletzing

Journal of geophysical research. Space physics, Vol.125(8), e2020JA028094

08/01/2020

DOI: 10.1029/2020JA028094

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Abstract

The nonlinear growth theory of chorus emissions is used to develop a simple model of the subpacket formation. The model assumes that the resonant current, which is released from the source to the upstream region, radiates a new whistler mode wave with a slightly increased frequency, which triggers a new subpacket. Saturation of the growth in amplitude is controlled by the optimum amplitude. Numerical solution of advection equations for each subpacket, with the chorus equations acting as the boundary conditions, produces a chorus element with a subpacket structure. This element features an upstream shift of the source region with time and an irregular growth of frequency, showing small decreases between adjacent subpackets. The influence of input parameters on the number of subpackets, the shift of the source, the frequency sweep rate, and the maximum amplitude is analyzed. The model well captures basic features of instantaneous frequency measurements provided by the Van Allen Probes spacecraft. The modeled wave field can be used in future particle acceleration studies.

Physical Sciences

Astronomy & Astrophysics

Science & Technology

Details

Title: Subtitle: A Model of the Subpacket Structure of Rising Tone Chorus Emissions
Creators: Miroslav Hanzelka - Charles University
Ondrej Santolik - Charles University
Yoshiharu Omura - Kyoto University
Ivana Kolmasova - Charles University
Craig A. Kletzing - University of Iowa
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.125(8), e2020JA028094
DOI: 10.1029/2020JA028094
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 17
Grant note: Czech Academy of Sciences through the Praemium Academiae award FM/c/2019-1-004 / Charles University through the Mobility Fund 64120 / Charles University through the GA UK project LTAUSA17070 / MEYS grant JSPS19-05 / Czech Academy of Sciences through the Mobility Plus grant 15H05815; 17H06140 / JSPS KAKENHI; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI)
Language: English
Date published: 08/01/2020
Academic Unit: Physics and Astronomy
Record Identifier: 9984429034702771

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