scholarly journals Large parallel electric fields, currents, and density cavities in dispersive Alfvén waves above the aurora

2007 ◽  
Vol 112 (A5) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. C. Chaston ◽  
A. J. Hull ◽  
J. W. Bonnell ◽  
C. W. Carlson ◽  
R. E. Ergun ◽  
...  
Keyword(s):  
Electric Fields ◽  
Alfven Waves ◽  
Alfvén Waves

scholarly journals Thermal electron anisotropy driven by kinetic Alfven waves in the Earth's magnetotail

2020 ◽  
Author(s):  
Alexander Lukin ◽  
Anton Artemyev ◽  
Evgeny Panov ◽  
Rumi Nakamura ◽  
Anatoly Petrukovich ◽  
...  
Keyword(s):  
Electric Fields ◽  
Electromagnetic Waves ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Plasma Flows ◽  
Thermal Electron ◽  
Electron Population ◽  
Electron Field ◽  
Kinetic Alfvén Waves

Abstract. Thermal and subthermal electron populations in the Earth's magnetotail are usually characterized by pronounced field-aligned anisotropy that contributes to generation of strong electric currents within the magnetotail current sheet. Formation of this anisotropy requires electron field-aligned acceleration, and thus likely involves field-aligned electric fields. Such fields can be carried by various electromagnetic waves generated by fast plasma flows interacting with ambient magnetotail plasma. In this paper we consider one of the most intense observed wave emissions, kinetic Alfven waves, that often accompany fast plasma flows in the magnetotail. Using two tail seasons (2017, 2018) of MMS observations we have collected statistics of 80 fast plasma flows (or bursty bulk flows) events with distinctive enhancement of intensity of broadband electromagnetic waves (kinetic Alfven waves). We show correlation the intensity of electric fields of kinetic Alfven waves and characteristics of electron anisotropy distributions: the parallel electron anisotropy increases with magnitude of the wave parallel electric field. Also the energy range of this electron anisotropic population is well within the expected acceleration range for assumed kinetic Alfven waves. Our results indicate an important role of KAWs in production of thermal field-aligned electron population typically observed in the Earth's magnetotail.

Hybrid magnetohydrodynamic–kinetic model of standing shear Alfvén waves

2003 ◽  
Vol 69 (4) ◽  
pp. 277-304 ◽  
Author(s):  
PETER A. DAMIANO ◽  
R. D. SYDORA ◽  
J. C. SAMSON
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Cold Plasma ◽  
Electron Distribution Function ◽  
Alfven Waves ◽  
Mhd Equations ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Model Parameters ◽  
Shear Alfven Waves

We have developed a hybrid magnetohydrodynamics (MHD) –kinetic box model valid for standing shear Alfvén waves using the cold plasma MHD equations coupled to a system of kinetic electrons. The guiding centre equations are used for the motion of the electrons and the system is closed via an expression for the field-aligned electric field in terms of the perpendicular electric field and moments of the electron distribution function. The perpendicular electric fields are derived from the ideal MHD approximation. We outline the basic model equations and method of solution. Simulations are then presented comparing the hybrid model results with a cold plasma MHD model. Landau damping is shown to heavily damp the standing shear Alfvén wave in the hybrid simulations when $v_{th} \ge V_{A}$. The damping rate is shown to be in good agreement with the theoretical rate calculated for the model parameters.

Localized parallel electric fields associated with inertial Alfvén waves

2005 ◽  
Vol 12 (7) ◽  
pp. 072901 ◽  
Author(s):  
R. E. Ergun ◽  
L. Andersson ◽  
Y.-J. Su ◽  
D. L. Newman ◽  
M. V. Goldman ◽  
...  
Keyword(s):  
Electric Fields ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Inertial Alfvén Waves

scholarly journals Relation between optical emissions, particles, electric fields, and Alfvén waves in a multiple rayed arc

2001 ◽  
Vol 106 (A8) ◽  
pp. 15445-15454 ◽  
Author(s):  
Thomas J. Hallinan ◽  
J. Kimball ◽  
H. C. Stenbaek-Nielsen ◽  
K. Lynch ◽  
R. Arnoldy ◽  
...  
Keyword(s):  
Electric Fields ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Optical Emissions
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