The interaction between the Moon and the solar wind

Document identifier: oai:DiVA.org:ltu-7795
Access full text here:10.5047/eps.2011.06.040
Keyword: Engineering and Technology, Mechanical Engineering, Aerospace Engineering, Teknik och teknologier, Maskinteknik, Rymd- och flygteknik
Publication year: 2012
Abstract:

We study the interaction between the Moon and the solar wind using a three-dimensional hybrid plasma solver. The proton fluxes and electromagnetical fields are presented for typical solar wind conditions with different magnetic field directions. We find two different wake structures for an interplanetary magnetic field that is perpendicular to the solar wind flow, and for one that is parallell to the flow. The wake for intermediate magnetic field directions will be a mix of these two extreme conditions. Several features are consistent with a fluid interaction, e.g., the presence of a rarefaction cone, and an increased magnetic field in the wake. There are however several kinetic features of the interaction. We find kinks in the magnetic field at the wake boundary. There are also density and magnetic field variations in the far wake, maybe from an ion beam instability related to the wake refill. The results are compared to observations by the WIND spacecraft during a wake crossing. The model magnetic field and ion velocities are in agreement with the measurements. The density and the electron temperature in the central wake are not as well captured by the model, probably from the lack of electron physics in the hybrid model.

Authors

Mats Holmström

Swedish Institute of Space Physics / Institutet för rymdfysik
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Shahab Fatemi

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Yoshifumi Futaana

Swedish Institute of Space Physics / Institutet för rymdfysik
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Hans Nilsson

Swedish Institute of Space Physics / Institutet för rymdfysik
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