Seismology of solar spicules based on Hinode/SOT observations

TL;DR

This paper investigates the oscillatory behavior of solar spicules using Hinode/SOT observations, revealing their transverse displacements, magnetic field strengths, and energy fluxes, contributing to understanding solar atmospheric dynamics.

Contribution

It provides new measurements of spicule oscillation periods, amplitudes, magnetic fields, and energy fluxes based on high-resolution Hinode/SOT data.

Findings

Transverse displacement periods of 40-150 seconds

Magnetic field strengths of 2-12.5 G in spicules

Energy flux estimates of 7-227 J/m^2s

Abstract

We analyze the time series of Ca ii H-line obtained from Hinode/SOT on the solar limb. The time-distance analysis shows that the axis of spicule undergoes quasi-periodic transverse displacement. We determined the period of transverse displacement as ~40-150 s and the mean amplitude as ~ 0.1-0.5 arcsec. For the oscillation wavelength of $\lambda$ ~ 1/0.06 arcsec ~ 11500 km, the estimated kink speed is ~ 13-83 km/s. We obtained the magnetic field strength in spicules as B_0 = 2 - 12.5 G and the energy flux as 7 - 227 J/m^-2s.