Inhomogeneous Power Distribution in Magnetic Oscillations

TL;DR

This study investigates the uneven distribution of acoustic power in solar magnetic oscillations using advanced spectral analysis methods, revealing asymmetries related to frequency, time, and magnetic field strength.

Contribution

It introduces a novel application of ring-diagram and spherical harmonic analysis to magnetic data, highlighting non-homogeneous power distribution in solar oscillations.

Findings

Evidence of five-minute oscillations in magnetic signals.

Asymmetry in oscillatory power varies with frequency, time, and magnetic field.

Comparison shows differences between magnetic and velocity oscillation power.

Abstract

We apply ring-diagram analysis and spherical harmonic decomposition methods to compute 3-dimensional power spectra of magnetograms obtained by the Global Oscillation Network Group (GONG) during quiet periods of solar activity. This allows us to investigate the power distribution in acoustic waves propagating in localized directions on the solar disk. We find evidence of the presence of five-minute oscillations in magnetic signals that suggests a non-homogeneous distribution of acoustic power. In this paper, we present our results on the asymmetry in oscillatory power and its behaviour as a function of frequency, time and magnetic field strength. These characteristics are compared with simultaneous velocity measurements.