Quasi-Thermal Noise Spectroscopy in Magnetized Space Plasma: Theory and Model

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
P. Dazzi, K. Issautier, N. Meyer-Vernet, P. Henri, M. M. Martinović
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Abstract

The quasi-thermal noise measured by an electric antenna is routinely used to characterize space plasmas, mainly measuring the electrons' properties. To employ this diagnostic technique, instrumental models are required to turn the instrumental output into physically meaningful measurements. Such models have been developed mainly under the assumption that no magnetic field is present in the plasma. This limit case is not met in planetary magnetospheres, for example, Earth, Mercury. The latter is the objective of the European Space Agency/Japan Aerospace Exploration Agency BepiColombo mission, that has a dedicated quasi-thermal noise experiment. The aim of this work is to extend the current state-of-the-art in quasi-thermal noise modeling by taking into account the magnetic field, therefore providing a plasma diagnostic in this magnetized regime. To achieve this goal, we developed a model for the quasi-thermal noise in a magnetized plasma. We explore four cases: for a Maxwellian and double Maxwellian electron distributions, both in the collisionless limit and in the presence of weak electron-neutral collisions. Our model is validated against known behaviors of the magnetized quasi-thermal noise spectrum, including: the characteristic frequency of maxima and minima, the modulation from the antenna spinning around the magnetic field, the electron temperature(s) influence. We explored parameter ranges that were not accessible to previous quasi-thermal noise models, in particular the high magnetization regime. The model we developed will enable using quasi-thermal noise experiments for the diagnostic of magnetospheric space plasmas, including but not limited to the Hermean and terrestrial magnetospheres, with foreseen applications to future space missions.

磁化空间等离子体的准热噪声光谱:理论与模型
由电天线测量的准热噪声通常用于表征空间等离子体,主要是测量电子的性质。为了采用这种诊断技术,需要建立仪器模型,将仪器输出转化为物理上有意义的测量结果。这些模型主要是在假定等离子体中不存在磁场的情况下建立起来的。这个极限情况在行星磁层中是不满足的,例如,地球,水星。后者是欧洲空间局/日本宇宙航空研究开发机构BepiColombo任务的目标,该任务有一个专门的准热噪声实验。这项工作的目的是通过考虑磁场来扩展当前最先进的准热噪声建模,从而在这种磁化状态下提供等离子体诊断。为了实现这一目标,我们建立了磁化等离子体中的准热噪声模型。我们探讨了四种情况:在无碰撞极限和弱电子-中性碰撞存在下的麦克斯韦式和双麦克斯韦式电子分布。我们的模型针对已知的磁化准热噪声谱的行为进行了验证,包括:极大值和极小值的特征频率,天线绕磁场旋转的调制,电子温度的影响。我们探索了以前的准热噪声模型无法达到的参数范围,特别是高磁化状态。我们开发的模型将允许使用准热噪声实验来诊断磁层空间等离子体,包括但不限于地球磁层和地球磁层,并可预见应用于未来的太空任务。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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