The Effect of Electron Temperature Anisotropy on the Field-Aligned Propagation of Whistler Waves

1981 ◽  
Vol 50 (6) ◽  
pp. 1821-1822
Author(s):  
Tomikazu Namikawa ◽  
Hiromitsu Hamabata ◽  
Kazuhiko Tanabe
2017 ◽  
Vol 35 (4) ◽  
pp. 885-892 ◽  
Author(s):  
Keizo Fujimoto

Abstract. A new mechanism to generate whistler waves in the course of collisionless magnetic reconnection is proposed. It is found that intense whistler emissions occur in association with plasmoid collisions. The key processes are strong perpendicular heating of the electrons through a secondary magnetic reconnection during plasmoid collision and the subsequent compression of the ambient magnetic field, leading to whistler instability due to the electron temperature anisotropy. The emissions have a bursty nature, completing in a short time within the ion timescales, as has often been observed in the Earth's magnetosphere. The whistler waves can accelerate the electrons in the parallel direction, contributing to the generation of high-energy electrons. The present study suggests that the bursty emission of whistler waves could be an indicator of plasmoid collisions and the associated particle energization during collisionless magnetic reconnection.


Solar Physics ◽  
1996 ◽  
Vol 168 (2) ◽  
pp. 345-355 ◽  
Author(s):  
Jie Zhao ◽  
Jun-Ichi Sakai ◽  
Ken-Ichi Nishikawa

1981 ◽  
Vol 26 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Tomikazu Namikawa ◽  
Hiromitsu Hamabata ◽  
Kazuhiko Tanabe

The first-order Chew, Goldberger & Low (GGL) equations for electrons including the effect of finite Larmor radius are applied to the whistler wave. The zerothorder velocity distribution function for electrons in the GGL expansion is assumed to be an anisotropic Maxwellian. The effect of electron thermal motion on the propagation of whistler waves is analysed by use of a dispersion relation and properties of the refractive index surface. It is shown that the electron thermal motion intensifies the tendency of whistler waves to follow the lines of force of the earth's magnetic field at appropriate values of electron temperature anisotropy.


1983 ◽  
Vol 30 (2) ◽  
pp. 291-301 ◽  
Author(s):  
Hiromitsu Hamabata

The first-order CGL fluid equations for electrons including the first-order heat fluxes are applied to the propagation of whistler waves. The dispersion relation of whistler waves is derived for two types of equilibrium electron distribution functions with cold and hot components. The effect of electron temperature anisotropy and the existence of cold electrons on the field-aligned propagation of whistler waves is analysed. It is shown that the electron temperature anisotropy intensifies the tendency of whistler waves to follow the lines of force of static magnetic field, that the existence of cold electrons in an anisotropic plasma further intensifies this tendency, and that under certain conditions the waves propagate only along the static magnetic field.


AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 055227 ◽  
Author(s):  
M. Usman Malik ◽  
W. Masood ◽  
M. N. S. Qureshi ◽  
Arshad M. Mirza

1985 ◽  
Vol 90 (A8) ◽  
pp. 7607-7610 ◽  
Author(s):  
S. Peter Gary ◽  
Christian D. Madland

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