Langmuir instabilities in the solar wind plasma
The development of the anisotropy of the electron distribution function in the lower solar corona has been studied through a test-particle model, revealing that particles with ν∥ > 5re will eventually run away owing to the magnetic pumping effect. The scaling with ν∥ of the parallel distribut...
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| Autores principales: | , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0004637X_v461_n1PARTI_p472_Canullo |
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| Sumario: | The development of the anisotropy of the electron distribution function in the lower solar corona has been studied through a test-particle model, revealing that particles with ν∥ > 5re will eventually run away owing to the magnetic pumping effect. The scaling with ν∥ of the parallel distribution function and of the perpendicular temperature is also derived. The theory shows a suprathermal tail originated near the coronal base that dominates the energy flux at distances r ≃ 4 Ṙ. We analyze the high-frequency instability produced by the small anisotropy in perpendicular energy of the runaway electron distribution in the magnetized plasma of the solar wind. A phenomenological description of this instability is obtained. It is also reported that the stability behavior is uncorrelated with the perpendicular temperature profile. The efficiency of Langmuir oscillations as a heating mechanism for the solar wind is discussed. © 1996. The American Astronomical Society. All rights reserved. |
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