Indications of r-mode Oscillations in SOHO/MDI Solar Radius Measurements

TL;DR

This paper presents evidence of solar internal r-mode oscillations detected in SOHO/MDI solar radius data, supporting previous findings and suggesting oscillations in an inner tachocline separating the core from the radiative envelope.

Contribution

It provides new analysis of SOHO/MDI data confirming r-mode oscillations and linking them to an inner tachocline, advancing understanding of solar internal dynamics.

Findings

Detection of r-mode oscillations in SOHO/MDI data

Oscillation frequencies compatible with an inner tachocline

Supports previous evidence from Mt Wilson and nuclear-decay data

Abstract

Analysis of solar radius measurements acquired by the Michelson Doppler Imager on the SOHO spacecraft supports previously reported evidence of solar internal r-mode oscillations in Mt Wilson radius data and in nuclear-decay data acquired at the Lomonosov Moscow State University. The frequencies of these oscillations are compatible with oscillations in a putative inner tachocline that separates a slowly rotating core from the radiative envelope.