Density-gradient-driven drift waves in the solar corona

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Physics of Plasmas Pub Date : 2024-09-05 DOI:10.1063/5.0223417
M. Brchnelova, M. J. Pueschel, S. Poedts
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Abstract

It has been suggested that under solar coronal conditions, drift waves may contribute to coronal heating. Specific properties of the drift waves to be expected in the solar corona have, however, not yet been determined using more advanced numerical models. We investigate the linear properties of density-gradient-driven drift waves in the solar coronal plasma using gyrokinetic ion–electron simulations with the gyrokinetic code Gene, solving the Vlasov–Maxwell equations in five dimensions assuming a simple slab geometry. We determine the frequencies and growth rates of the coronal density gradient-driven drift waves with changing plasma parameters, such as the electron β, the density gradient, the magnetic shear, and additional temperature gradients. To investigate the influence of the finite Larmor radius effect on the growth and structure of the modes, we also compare the gyrokinetic simulation results to those obtained from drift-kinetics. In most of the investigated conditions, the drift wave has positive growth rates that increase with increasing density gradient and decreasing β. In the case of increasing magnetic shear, we find that from a certain point, the growth rate reaches a plateau. Depending on the considered reference environment, the frequencies and growth rates of these waves lie on the order of 0.1 mHz–1 Hz. These values correspond to the observed solar wind density fluctuations near the Sun detected by WISPR, currently of unexplained origin. As a next step, nonlinear simulations are required to determine the expected fluctuation amplitudes and the plasma heating resulting from this mechanism.
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日冕中的密度梯度驱动漂移波
有人认为,在日冕条件下,漂移波可能有助于日冕加热。然而,人们尚未利用更先进的数值模型确定日冕中漂移波的具体特性。我们使用陀螺动力学离子-电子模拟代码 Gene,研究了日冕等离子体中密度梯度驱动的漂移波的线性特性,假设一个简单的板状几何结构,在五个维度上求解 Vlasov-Maxwell 方程。我们确定了日冕密度梯度驱动的漂移波在电子β、密度梯度、磁剪切和附加温度梯度等等离子体参数变化时的频率和增长率。为了研究有限拉莫尔半径效应对模式增长和结构的影响,我们还将陀螺动力学模拟结果与漂移动力学模拟结果进行了比较。在大多数研究条件下,漂移波的增长率为正值,随着密度梯度的增大和β的减小而增大。根据所考虑的参考环境,这些波的频率和增长率在 0.1 mHz-1 Hz 之间。这些数值与 WISPR 检测到的太阳附近的太阳风密度波动相对应,目前这些波动的原因尚无法解释。下一步需要进行非线性模拟,以确定预期的波动幅度和这一机制导致的等离子体加热。
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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