Electron Energization by Parallel Electric Fields in Poloidal Standing Waves
Electron Energization by Parallel Electric Fields in Poloidal Standing Waves
复制标题
DOI：
10.1029/2019ja026849
复制
发表时间：
2019-08-01
影响因子：
2.8
通讯作者：
Porazik, P.
中科院分区：
文献类型：
--
作者：
Damiano, P. A.;Kim, E-H;Porazik, P.
采用旋流-动能混合电子模型，模拟了不同电子温度和方位向模数下的极向驻留模。与以前对环形驻留模的研究一样，随着环境电子温度的升高，镜面力效应导致平行势降增加，电子单能激发，波能量耗散。当电子温度保持不变，方位模数增加时，也观察到类似的趋势--由于方位向通量管宽度变窄，这需要更多的电子能量来携带增加的平行电流密度。在这两种情况下，由于波能的耗散，电子能量的增加最终导致平行电流随时间的更快的下降。
A hybrid gyrofluid-kinetic electron model is adapted and used to simulate poloidal standing modes for different electron temperatures and azimuthal mode numbers. As in previous studies of toroidal standing modes, mirror force effects lead to increased parallel potential drops, monoenergetic electron energization, and wave energy dissipation as the ambient electron temperature is increased. A similar trend is also observed when the electron temperature is held fixed and the azimuthal mode number increased-owing to the narrowing of the azimuthal flux tube width, which necessitates more electron energization to carry the increased parallel current density. In both cases, the increase in electron energization eventually leads to more rapid decreases in the parallel current with time because of the dissipation of wave energy.