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Article Dans Une Revue Astronomical Notes / Astronomische Nachrichten Année : 2017

Electron acceleration and small-scale coherent structure formation by an Alfvén wave propagating in coronal interplume region

K. Daiffallah
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Fabrice Mottez
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Résumé

We use 2.5-D electromagnetic particle-in-cell simulation code to investigate the acceleration of electrons in solar coronal holes through the interaction of Alfvén waves with an interplume region. The interplume is modeled by a cavity density gradients that are perpendicular to the background magnetic field. The aim is to contribute to explain the observation of suprathermal electrons under relatively quiet sun. Simulations show that Alfvén waves in interaction with the interplume region gives rise to a strong local electric field that accelerates electrons in the direction parallel to the background magnetic field. Suprathermal electron beams and small-scale coherent structures are observed within interplume of strong density gradients. These features result from non linear evolution of the electron beam plasma instability.
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Dates et versions

hal-02392030 , version 1 (03-12-2019)

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K. Daiffallah, Fabrice Mottez. Electron acceleration and small-scale coherent structure formation by an Alfvén wave propagating in coronal interplume region. Astronomical Notes / Astronomische Nachrichten, 2017, 338 (7), pp.781-789. ⟨10.1002/asna.201713364⟩. ⟨hal-02392030⟩
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