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Issue A&A
Volume 449, Number 2, April II 2006
Page(s) L35 - L38
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200600018

A&A 449, L35-L38 (2006)
DOI: 10.1051/0004-6361:200600018

Letter

Observation of kink waves in solar spicules

V. Kukhianidze1, T. V. Zaqarashvili1, 2 and E. Khutsishvili1

1  Abastumani Astrophysical Observatory, Kazbegi Ave. 2a, Tbilisi 0160, Georgia
    e-mail: [vaso;temury;eldar]@genao.org
2  Departament de Física, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
    e-mail: temury.zaqarashvili@uib.es

(Received 15 November 2005 / Accepted 21 February 2006)

Abstract
Height series of H${\alpha}$ spectra in solar limb spicules obtained with the 53 cm coronagraph of the Abastumani Astrophysical Observatory are analyzed. Each height series covered 8 different heights beginning at 3800 km above the photosphere. The spatial difference between neighboring heights was 1 $^{\prime \prime}$, consequently ~3800-8700 km distance above the photosphere has been covered. The total time duration of each height series was 7 s. We found that nearly 20% of measured height series show a periodic spatial distribution of Doppler velocities. We suggest that this spatial periodicity in Doppler velocity is caused by propagating kink waves in spicules. The wave length is found to be ~3500 km. However the wave length tends to be ~1000 km at the photosphere due to the height variation of the kink speed. This probably indicates to a granular origin for the waves. The period of waves is estimated to be in the range of 35-70 s. These waves may carry photospheric energy into the corona, therefore can be of importance in coronal heating.


Key words: Sun: chromosphere -- Sun: oscillations





© ESO 2006


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