Correlation Analysis of Mode Frequencies with Activity Proxies at Different Phases of the Solar Cycle

TL;DR

This study investigates how solar oscillation mode frequencies correlate with solar activity proxies throughout different phases of the solar cycle, revealing phase-dependent variations in correlation strength.

Contribution

It provides a detailed analysis of the linear relationship between mode frequencies and activity proxies across the solar cycle phases, highlighting phase-specific correlation differences.

Findings

Strong correlation during rising and declining phases

Lower correlation during low and high activity periods

Frequencies vary linearly with activity proxies

Abstract

We analyze intermediate degree p- and f-mode eigenfrequencies measured by GONG and MDI/SOHO for a complete solar cycle to study their correlation with solar activity. We demonstrate that the frequencies do vary linearly with the activity, however the degree of correlation differs from phase to phase of the cycle. During the rising and the declining phases, the mode frequencies are strongly correlated with the activity proxies whereas during the low- and high-activity periods, the frequencies have significantly lower correlation with all the activity proxies considered here.