The Role of Anisotropic Proton Pressure in the Generation of Geomagnetic Pulsations

—The effect of hot anisotropic plasma on the development of cyclotron instability in the near-Earth space plasma at finite plasma pressure is studied. It is shown that the finiteness of ​ does not only modify the imaginary part of the dispersion equation which is associated with the amplification of...

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Bibliographic Details
Published in:Izvestiya. Physics of the solid earth 2021, Vol.57 (1), p.54-60
Main Authors: Feygin, F. Z., Khabazin, Yu. G.
Format: Article
Language:English
Subjects:
Anisotropy
Cyclotrons
Earth and Environmental Science
Earth Sciences
Geomagnetic pulsations
Geomagnetism
Geophysics/Geodesy
Magnetic field
Magnetic fields
Magnetism
Plasma
Plasma pressure
Pressure
Protons
Space plasmas
Wave propagation
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Summary:—The effect of hot anisotropic plasma on the development of cyclotron instability in the near-Earth space plasma at finite plasma pressure is studied. It is shown that the finiteness of ​ does not only modify the imaginary part of the dispersion equation which is associated with the amplification of waves but also changes the real part of this equation which describes wave propagation along the magnetic field lines. This leads to a change in the cyclotron instability increment and causes variations in the parameters of propagation of electromagnetic ion-cyclotron (EMIC) waves along a field line. The obtained results suggest that for the generation of EMIC waves in the near-Earth plasma, small values of perpendicular proton plasma pressure ( ), large anisotropy values ( ), and large values of ratio are preferable.
ISSN:1069-3513
1555-6506
DOI:10.1134/S1069351321010031