The Effects of Thermal Electrons on Whistler Mode Waves Excited by Anisotropic Hot Electrons: Linear Theory and 2‐D PIC Simulations

2019 ◽  
Vol 124 (7) ◽  
pp. 5234-5245 ◽  
Author(s):  
Kai Fan ◽  
Xinliang Gao ◽  
Quanming Lu ◽  
Jun Guo ◽  
Shui Wang
Keyword(s):  
Linear Theory ◽  
Hot Electrons ◽  
Whistler Mode ◽  
Whistler Mode Waves

On the propagation of half-gyrofrequency whistler-mode waves in the magnetospheric plasma

1986 ◽  
Vol 36 (3) ◽  
pp. 379-385 ◽  
Author(s):  
N. Ohmi ◽  
M. Hayakawa
Keyword(s):  
Hot Electrons ◽  
Mode Propagation ◽  
Large Wave ◽  
Whistler Mode ◽  
Hot Plasma ◽  
Two Component ◽  
Component Plasma ◽  
Whistler Mode Waves ◽  
Electron Gyrofrequency ◽  
Wave Normal

The propagation of whistler-mode waves at frequencies above one half the electron gyrofrequency has been investigated for a magnetospheric two-component plasma (cold and lower energy hot electrons) by use of the properties of refractive index surfaces. The presence of hot plasma is found to enhance the tendency towards field-aligned focusing of half-gyrofrequency whistler-mode propagation at large wave normal angles close to the oblique resonance angle of the whistler-mode propagation in the corresponding cold plasma.

scholarly journals Quasi-parallel whistler mode waves observed by THEMIS during near-earth dipolarizations

2009 ◽  
Vol 27 (6) ◽  
pp. 2259-2275 ◽  
Author(s):  
O. Le Contel ◽  
A. Roux ◽  
C. Jacquey ◽  
P. Robert ◽  
M. Berthomier ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Temperature ◽  
Linear Theory ◽  
Broad Band ◽  
Temperature Anisotropy ◽  
Whistler Mode ◽  
Background Magnetic Field ◽  
Whistler Mode Waves ◽  
Liouville’S Theorem

Abstract. We report on quasi-parallel whistler emissions detected by the near-earth satellites of the THEMIS mission before, during, and after local dipolarization. These emissions are associated with an electron temperature anisotropy α=T⊥e/T||e>1 consistent with the linear theory of whistler mode anisotropy instability. When the whistler mode emissions are observed the measured electron anisotropy varies inversely with β||e (the ratio of the electron parallel pressure to the magnetic pressure) as predicted by Gary and Wang (1996). Narrow band whistler emissions correspond to the small α existing before dipolarization whereas the broad band emissions correspond to large α observed during and after dipolarization. The energy in the whistler mode is leaving the current sheet and is propagating along the background magnetic field, towards the Earth. A simple time-independent description based on the Liouville's theorem indicates that the electron temperature anisotropy decreases with the distance along the magnetic field from the equator. Once this variation of α is taken into account, the linear theory predicts an equatorial origin for the whistler mode. The linear theory is also consistent with the observed bandwidth of wave emissions. Yet, the anisotropy required to be fully consistent with the observations is somewhat larger than the measured one. Although the discrepancy remains within the instrumental error bars, this could be due to time-dependent effects which have been neglected. The possible role of the whistler waves in the substorm process is discussed.

scholarly journals Radio waves and whistler-mode waves in solar wind and their interactions with energetic electrons

2020 ◽  
Author(s):  
Cynthia Cattell ◽  
Aaron Breneman ◽  
Lindsay Glesener ◽  
Ben Leiran ◽  
Ben Short ◽  
...  
Keyword(s):  
Solar Wind ◽  
Radio Waves ◽  
Whistler Mode ◽  
Energetic Electrons ◽  
Whistler Mode Waves

scholarly journals Oblique “1-Hz” whistler mode waves in an electron foreshock: The Cassini near-Earth encounter

2001 ◽  
Vol 106 (A12) ◽  
pp. 30223-30238 ◽  
Author(s):  
Bruce T. Tsurutani ◽  
Edward J. Smith ◽  
Marcia E. Burton ◽  
John K. Arballo ◽  
Carlos Galvan ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Whistler Mode Waves
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