Temporal Variations of High-Degree Solar p-Modes using Ring-Diagram Analysis

TL;DR

This study analyzes how high-degree solar p-modes' amplitudes and widths vary over time using ring-diagram analysis across multiple instruments, revealing consistent responses to magnetic activity and differences between solar cycles 23 and 24.

Contribution

It provides a comparative analysis of high-degree p-mode variations across different solar cycles using multiple instruments and the ring-diagram technique.

Findings

Mode amplitudes and widths respond similarly across instruments.

Lower variation in mode parameters during cycle 24.

Mode parameters correlate with magnetic activity levels.

Abstract

We study temporal variations in the amplitudes and widths of high-degree acoustic modes by applying the ring-diagram technique to the GONG+, MDI and HMI Dopplergrams during the declining phase of cycle 23 and rising phase of cycle 24. The mode parameters from all three instruments respond similarly to the varying magnetic activity. The mode amplitudes and widths show consistently lower variation due to smaller magnetic activity in cycle 24 as compared to the previous solar cycle.