The global oscillations of the sun from tsi, soho and sdo data

TL;DR

This study investigates the Sun's global oscillations using diverse observational data, revealing specific low-frequency modes and a stable 9-day oscillation linked to the Sun's core dynamics.

Contribution

It introduces a multi-data approach to analyze solar oscillations, identifying new low-frequency modes and confirming a stable 9-day oscillation related to the Sun's core.

Findings

Identified low-frequency modes at 8-10 hours and 36-38 hours.

Detected a stable 9-day oscillation.

Linked the 9-day mode to core oscillatory processes.

Abstract

The global oscillations of the Sun are investigated on the base of three independent sets of data: 1. Records of Total Solar Irradiance (TSI). 2. The average brightness of the photosphere in MDI (SOHO) and HMI (SDO) images. 3. Records of the time variations of sunlight reflected from the planets during their passage in the field of view of the LASCO C3 coronagraph. It is found that in the low-frequency spectrum of solar oscillations as a star there are modes of 8-10, 36-38 hours and the main stable 9-day mode. The last mode can be regarded as a reflection of oscillatory processes near the fast rotating core of the Sun according to Fossat et al. (2017).