EGU21-8905
https://doi.org/10.5194/egusphere-egu21-8905
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Helical Magnetic Cavities: Kinetic Model and Comparison with MMS Observations

Jinghuan Li1, Xuzhi Zhou1, Fan Yang1, Anton V. Artemyev2,3, and Qiugang Zong1
Jinghuan Li et al.
  • 1Peking university, China (jinghuan.li@pku.edu.cn)
  • 2Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90034, USA
  • 3Space Research Institute, Russian Academy of Sciences, Moscow 117997, Russia

Magnetic cavities are sudden depressions of magnetic field strength widely observed in the space plasma environments, which are often accompanied by plasma density and pressure enhancement. To describe these cavities, a self-consistent kinetic model has been proposed as an equilibrium solution to the Vlasov-Maxwell equations. However, observations from the Magnetospheric Multi-Scale (MMS) constellation have shown the existence of helical magnetic cavities characterized by the presence of azimuthal magnetic field, which could not be reconstructed by the aforementioned model. Here, we take into account another invariant of motion, the canonical axial momentum, to construct the particle distributions and accordingly modify the equilibrium model. The reconstructed magnetic cavity shows excellent agreement with the MMS1 observations not only in the electromagnetic field and plasma moment profiles but also in electron pitch-angle distributions. With the same set of parameters, the model also predicts signatures of the neighboring MMS3 spacecraft, matching its observations satisfactorily.

How to cite: Li, J., Zhou, X., Yang, F., Artemyev, A. V., and Zong, Q.: Helical Magnetic Cavities: Kinetic Model and Comparison with MMS Observations, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8905, https://doi.org/10.5194/egusphere-egu21-8905, 2021.

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