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Title: Excitation of Banded Whistler Waves in the Magnetosphere

Abstract

Banded whistler waves can be generated by the whistler anisotropy instability driven by two bi-Maxwellian electron components with T{sub {perpendicular}}/T{sub {parallel}} > 1 at different T{sub {parallel}} For typical magnetospheric condition of 1 < {omega}{sub e}/{Omega}{sub e} < 5 in regions associated with strong chorus, upper-band waves can be excited by anisotropic electrons below {approx} 1 keV, while lower-band waves are excited by anisotropic electrons above {approx} 10 keV. Lower-band waves are generally field-aligned and substantially electromagnetic, while upper-band waves propagate obliquely and have quasi-electrostatic fluctuating electric fields. The quasi-electrostatic feature of upper-band waves suggests that they may be more easily identified in electric field observations than in magnetic field observations. Upper-band waves are liable to Landau damping and the saturation level of upperband waves is lower than lower-band waves, consistent with observations that lower-band waves are stronger than upper-band waves on average. The oblique propagation, the lower saturation level, and the more severe Landau damping together would make upper-band waves more tightly confined to the geomagnetic equator (|{lambda}{sub m}| < {approx}10{sup o}) than lower-band waves.

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOD
OSTI Identifier:
1046514
Report Number(s):
LA-UR-12-22995
TRN: US1203782
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: DTRA Review ; 2012-07-19 - 2012-07-19 ; Los Alamos, New Mexico, United States
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANISOTROPY; ELECTRIC FIELDS; ELECTRONS; EXCITATION; GEOMAGNETIC EQUATOR; INSTABILITY; LANDAU DAMPING; MAGNETIC FIELDS; SATURATION; WHISTLERS

Citation Formats

Gary, S Peter, Liu, Kaijun, and Winske, Dan. Excitation of Banded Whistler Waves in the Magnetosphere. United States: N. p., 2012. Web.
Gary, S Peter, Liu, Kaijun, & Winske, Dan. Excitation of Banded Whistler Waves in the Magnetosphere. United States.
Gary, S Peter, Liu, Kaijun, and Winske, Dan. 2012. "Excitation of Banded Whistler Waves in the Magnetosphere". United States. https://www.osti.gov/servlets/purl/1046514.
@article{osti_1046514,
title = {Excitation of Banded Whistler Waves in the Magnetosphere},
author = {Gary, S Peter and Liu, Kaijun and Winske, Dan},
abstractNote = {Banded whistler waves can be generated by the whistler anisotropy instability driven by two bi-Maxwellian electron components with T{sub {perpendicular}}/T{sub {parallel}} > 1 at different T{sub {parallel}} For typical magnetospheric condition of 1 < {omega}{sub e}/{Omega}{sub e} < 5 in regions associated with strong chorus, upper-band waves can be excited by anisotropic electrons below {approx} 1 keV, while lower-band waves are excited by anisotropic electrons above {approx} 10 keV. Lower-band waves are generally field-aligned and substantially electromagnetic, while upper-band waves propagate obliquely and have quasi-electrostatic fluctuating electric fields. The quasi-electrostatic feature of upper-band waves suggests that they may be more easily identified in electric field observations than in magnetic field observations. Upper-band waves are liable to Landau damping and the saturation level of upperband waves is lower than lower-band waves, consistent with observations that lower-band waves are stronger than upper-band waves on average. The oblique propagation, the lower saturation level, and the more severe Landau damping together would make upper-band waves more tightly confined to the geomagnetic equator (|{lambda}{sub m}| < {approx}10{sup o}) than lower-band waves.},
doi = {},
url = {https://www.osti.gov/biblio/1046514}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jul 13 00:00:00 EDT 2012},
month = {Fri Jul 13 00:00:00 EDT 2012}
}

Conference:
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