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Observation of kink waves in solar spicules

V. Kukhianidze·T. V. Zaqarashvili·E. Khutsishvili
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Abstract

Height series of H$α$ 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 $\sim$ 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 $\sim$ 3500 km. However the wave length tends to be $\sim$ 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.

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V. Kukhianidze, T. V. Zaqarashvili, E. Khutsishvili. 2006-02-24. Observation of kink waves in solar spicules. https://doi.org/10.1051/0004-6361%3A200600018

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