Drift kinetic Alfvén wave in temperature anisotropic plasma

Abstract

By using the gyrokinetic theory, the kinetic Alfvén waves (KAWs) are discussed to emphasize the drift effects through the density inhomogeneity and the temperature anisotropy on their dispersion characteristics. The dependence of stabilization mechanism of the drift-Alfvén wave instability on the temperature anisotropy is highlighted. The estimate of the growth rate and the threshold condition for a wide range of parameters are also discussed.

Drift wave stabilized by an additional streaming ion or plasma population

“…The omitted electron terms make only minor changes in Eqs. (13,14): α 3 term is multiplied by a small factor 1 + (m e /m i ) 1/2 (T f i /T f e ) 3/2 , and the last term in denominator of Eq. ( 14) is multiplied by a term 1 + T f i /T f e .…”

Theoretical Prediction of Asymmetric Instability of Drift Kinetic Alfven Waves in Anisotropic Plasmas

“…Kinetic Alfvén waves (KAWs) are obliquely propagating low‐frequency waves, generated as a consequence of the coupling between Alfvén waves and the ion acoustic waves, when the perpendicular wavelength is comparable with the ion gyroradius (Chen & Hasegawa, ; Hasegawa, ; Lysak & Lotko, ; Lysak & Song, ). The coupling of KAWs with the diamagnetic drift waves through the density inhomogeneity results in the generation of drift kinetic Alfvén waves (DKAWs; Chaston et al, ; Naim et al, ; Onishchenko et al, ; Vranjes & Poedts, ).…”

“…KAWs are associated with various physical mechanisms in the magnetosphere, such as electron trapping and acceleration in the inner magnetosphere (Artemyev et al, ; Damiano & Wright, ; ; Kletzing, ), heating of the plasma sheet and plasma injections in the inner magnetosphere (Chaston et al, ), bursty bulk flows in the plasma sheet (Chaston et al, ), powering the aurora and acceleration of auroral electrons (Keiling et al, ), and coupling kinetic scale field line resonances (Chaston et al, ; Damiano & Johnson, ). The dispersion relation of KAWs has been related to explain the different physical mechanisms by using the kinetic theory for homogeneous (Bashir et al, ; Bashir & Murtaza, ; Lysak & Lotko, ; Moya et al, ; Yoon et al, ; Yoon & Schlickeiser, ) and inhomogeneous (Lysak & Song, ; Lysak, ; Naim et al, ) plasmas.…”

“…The interplay of energy sources when any two or more are present in the system provides insight into the stability mechanism of KAWs. The instability of KAWs for low beta plasma including the density gradient and the temperature anisotropy has been discussed through the particle‐aspect analysis (Duan et al, ) and drift kinetic theory (Naim et al, ).…”

The general dielectric tensor for bi-kappa magnetized plasmas

“…The numerical evaluation of the series can be substantially accelerated if one also employs the recurrence relations (14) and (19). However, we must point out that so far no analysis of the stability of these relations for forward recursion has been made.…”