New Model for Ionospheric Irregularities at Mars
New Model for Ionospheric Irregularities at Mars
复制标题
火星电离层不规则性的新模型
DOI：
10.1002/2017gl076507
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
M. Keskinen
中科院分区：
文献类型：
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作者：
M. Keskinen
本文提出了一个新的火星电离层不规则性模型。结果表明，风驱动电流在发电机区域的火星电离层可以是不稳定的电磁梯度漂移不稳定性。这种等离子体不稳定性可以产生电离层密度和磁场不规则性，其尺度大小约为15-20公里，小至几公里。我们发现，不稳定性驱动的磁场相对于背景的波动幅度与电离层相对于背景的密度波动幅度相关。我们的研究结果可以解释最近的观测火星大气和挥发性的演变航天器在火星电离层发电机区域。
A new model for ionospheric irregularities at Mars is presented. It is shown that wind‐driven currents in the dynamo region of the Martian ionosphere can be unstable to the electromagnetic gradient drift instability. This plasma instability can generate ionospheric density and magnetic field irregularities with scale sizes of approximately 15–20 km down to a few kilometers. We show that the instability‐driven magnetic field fluctuation amplitudes relative to background are correlated with the ionospheric density fluctuation amplitudes relative to background. Our results can explain recent observations made by the Mars Atmosphere and Volatile EvolutioN spacecraft in the Martian ionosphere dynamo region.