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    题名: Pitch-angle and energy diffusion of radiation belt electrons by lower-hybrid waves near the geomagnetic equator
    作者: Otsuka, F.;Wang, K.;S. Matsukiyo;T. Hada
    日期: 2016-06-28
    上传时间: 2016-09-23 02:10:56 (UTC+8)
    摘要: Wave-particle interaction plays an important role for radiation belt electron diffusion in the
    momentum space. Several different types of waves can contribute to the electron diffusion [1].
    Here we focus on the lower-hybrid waves (the so-called ‘equatorial noise’), which are
    frequently observed near the geomagnetic equator [2, 3]. The lower hybrid waves are in the
    frequency range between the proton gyrofrequency and the lower-hybrid frequency, and are
    propagating nearly perpendicular to the background magnetic field with almost linear
    polarization.
    In this presentation, we discuss the pitch-angle and energy diffusion of electrons caused by
    the lower-hybrid waves, performing one-dimensional test particle simulations. We specify the
    lower-hybrid waves based on the cold plasma dispersion relation and assume a Gaussian
    spectrum of the waves, in uniform and straight background magnetic fields. An important
    physical parameter is the wave propagation angle relative to the background magnetic fields.
    This angle is varied from 80 to 90 degrees. We evaluate the energy and the pitch-angle
    diffusion coefficients by taking an ensemble average of the test particle electrons. We will
    also discuss evolution of the electron distributions as functions of the pitch-angle and energy.
    關聯: Book of Abstracts, ICPP 2016, pp.PPM2-11
    显示于类别:[航空太空工程學系暨研究所] 會議論文

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