مقاله Transverse oscillations in solar spicules induced by propagating Alfvénic pulses : تی پی بین

خلاصه مقاله

The excitation of Alfvénic waves in solar spicules by localized Alfvénic pulses is investigated. A set of incompressible MHD equations in the two-dimensional x–z plane with steady flows and sheared magnetic fields is solved. Stratification due to gravity and transition region between chromosphere and corona is taken into account. An initially localized Alfvénic pulse launched below the transition region can penetrate from transition region into the corona. We show that the period of the transversal oscillations is in agreement with those observed in spicules. Moreover, it is found that the excited Alfvénic waves spread during propagation along the spicule length, and suffer efficient damping of the oscillations amplitude. The damping time of the transverse oscillations increased with decreasing k _b values.

نویسندگان

H. Ebadi [ Astrophysics Department, Physics Faculty, University of Tabriz, Tabriz, Iran ]

M. Hosseinpour [ Plasma Physics Department, Physics Faculty, University of Tabriz, Tabriz, Iran ]

Z. Fazel [ Astrophysics Department, Physics Faculty, University of Tabriz, Tabriz, Iran ]

کلمات کلیدی

Sun: spicules Alfvénic pulses

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Astrophysics and Space Science 2013

Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered.The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing.Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.Commonly used title abbreviations: Astrophys Space Sci, Ap SS

حوزه های تحت پوشش : Astrophysics and Astroparticles Astronomy, Observations and Techniques Cosmology Extraterrestrial Physics, Space Sciences Astrobiology