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Slow electrostatic solitary waves in Earth's plasma sheet boundary layer
Author(s) -
Kakad Amar,
Kakad Bharati,
Anekallu Chandrasekhar,
Lakhina Gurbax,
Omura Yoshiharu,
Fazakerley Andrew
Publication year - 2016
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja022365
Subject(s) - plasma sheet , physics , plasma , boundary layer , ion acoustic wave , electron , nonlinear system , acoustic wave , computational physics , ion , mechanics , geophysics , spacecraft , atomic physics , magnetosphere , optics , quantum mechanics , astronomy
We modeled Cluster spacecraft observations of slow electrostatic solitary waves (SESWs) in the Earth's northern plasma sheet boundary layer (PSBL) region on the basis of nonlinear fluid theory and fluid simulation. Various plasma parameters observed by the Cluster satellite at the time of the SESWs were examined to investigate the generation process of the SESWs. The nonlinear fluid model shows the coexistence of slow and fast ion acoustic waves and the presence of electron acoustic waves in the PSBL region. The fluid simulations, performed to examine the evolution of these waves in the PSBL region, showed the presence of an extra mode along with the waves supported by the nonlinear fluid theory. This extra mode is identified as the Buneman mode, which is generated by relative drifts of ions and electrons. A detailed investigation of the characteristics of the SESWs reveals that the SESWs are slow ion acoustic solitary waves.