Characteristics of oscillatory-wave processes in solar structures with various magnetic field topology |
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Authors: | N I Kobanov D Yu Kolobov A A Sklyar S A Chupin V A Pulyaev |
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Institution: | (1) Homer, IL, USA; |
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Abstract: | Recognizing that waves play an important role in energy-exchange processes between layers of the solar atmosphere, and that
the characteristics of propagating waves are determined by the physical conditions of the medium, and, most importantly, the
magnetic-field configuration, we have carried out a comparative analysis of the properties of oscillations in solar structures
with various magnetic-field topologies: sunspots, faculae, and coronal holes. Simultaneous measurements of the Doppler velocities
and intensities at the photospheric and chromospheric levels were accompanied by episodic measurements of the longitudinal
magnetic field. In the chromosphere, spot umbrae dominate the three-minute oscillations, while lower-frequency modes are also
observed in the penumbrae and at the outer parts of spots. Clear signs of propagating waves have been observed at the bases
of coronal holes and in faculae only at frequencies close to 3 mHz. |
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Keywords: | |
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