Observation of standing kink waves in solar spicules

TL;DR

This paper reports the observation of standing kink waves in solar spicules, analyzing their properties and confirming their nature through theoretical dispersion relation analysis.

Contribution

It provides the first observational evidence of standing kink waves in solar spicules and links observed oscillations to fundamental harmonic modes.

Findings

Mean period of ~180 seconds for transverse displacement

Amplitude of about 1 arcsecond

Oscillations consistent with fundamental standing kink modes

Abstract

We analyze the time series of CaII H-line obtained from Hinode/SOT on the solar limb. The time-distance analysis shows that the axis of spicule undergos quasi-periodic transverse displacement at different heights from the photosphere. The mean period of transverse displacement is ~180 s and the mean amplitude is 1 arcsec. Then, we solve the dispersion relation of magnetic tube waves and plot the dispersion curves with upward steady flows. The theoretical analysis shows that the observed oscillation may correspond to the fundamental harmonic of standing kink waves.