Spicules Intensity Oscillations in SOT/HINODE Observations

TL;DR

This study investigates the coherence of solar spicule intensity oscillations at various heights using HINODE/SOT data, supporting theories of coronal heating and solar wind through energy transport mechanisms.

Contribution

It provides new evidence of oscillation coherency up to the transition region, enhancing understanding of energy transfer in solar atmospheric layers.

Findings

Coherent oscillations observed up to the transition region.

Energy and mass transport estimates support coronal heating theories.

Fourier and wavelet analyses effectively identify dominant frequencies.

Abstract

Aims. We study the coherency of solar spicules intensity oscillations with increasing height above the solar limb in quiet Sun, active Sun and active region using observations from HINODE/SOT. Existence of coherency up to transition region strengthens the theory of the coronal heating and solar wind through energy transport and photospheric oscillations. Methods. Using time sequences from the HINODE/SOT in Ca II H line, we investigate oscillations found in intensity profiles at different heights above the solar limb. We use the Fourier and wavelet analysis to measure dominant frequency peaks of intensity at the heights, and phase difference between oscillations at two certain heights, to find evidence for the coherency of the oscillations. Finally, we can calculate the energy and the mass transported by spicules providing energy equilibrium, according to density values of spicules at different heights. To extend this work, we can also consider coherent oscillations at different latitudes and suggest to study of oscillations which may be obtained from observations of other satellites.