513 8 2141 1 5873 document 2141 A&A_Vasil_Kukhianidze_2007_Doppler_Spikules.pdf application/pdf 7a369a48f133d44c83b9d73c6373ec12 MD5 686981 2014-01-24 10:26:30 http://eprints.iliauni.edu.ge/513/1/A%26A_Vasil_Kukhianidze_2007_Doppler_Spikules.pdf 513 1 1 application/pdf text en public

A&A_Vasil_Kukhianidze_2007_Doppler_Spikules.pdf

2144 2 5888 document 2144 lightbox.jpg image/png 3565d88c2157ee0dff261d442eea678c MD5 56610 2014-01-24 10:36:46 http://eprints.iliauni.edu.ge/513/2/lightbox.jpg 513 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox ge public

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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/2141 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/2141 http://eprints.org/relation/ismediumThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/2141 2147 2 5891 document 2147 small.jpg image/png fe5cfbc9ffe99ebbbfa861784dacad2a MD5 1762 2014-01-24 10:36:50 http://eprints.iliauni.edu.ge/513/5/small.jpg 513 5 5 image/png other Thumbnails conversion from text to thumbnail_small ge public

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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/2141 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/2141 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/2141 archive 134 disk0/00/00/05/13 2014-01-25 08:11:56 2015-03-27 10:06:10 2014-01-25 08:11:56 article show Zaqarashvili T. Khutsishvili E. Kukhianidze V. vasil.kukhianidze@iliauni.edu.ge Ramishvili G. pub QB public Aims:We analysed the consecutive height series of Hα spectra in solar limb spicules taken on the 53 cm coronagraph of Abastumani Astrophysical Observatory at the heights of 3800-8700 km above the photosphere. Our aim is to observe oscillatory phenomena in spicules and consequently to trace wave propagations through the chromosphere. Methods: We use the Discrete Fourier Transform analysis of Hα Doppler shift time series constructed from the observed spectra at each height. Results: Doppler velocities of solar limb spicules show oscillations with periods of 20-55 and 75-110 s. There is also clear evidence of 3-min oscillations at the observed heights. Conclusions: The oscillations can be caused by wave propagations in thin magnetic flux tubes anchored in the photosphere. We suggest the granulation as a possible source of the wave excitation. Observed waves can be used as a tool for spicule seismology, and the magnetic field strength in spicules at the height of 6000 km above the photosphere is estimated as 12{-}15 G. 2007-11-01 published Astronomy and Astrophysics 474 2 EDP Sciences 627-632 10.1051/0004-6361:20077661 TRUE