Helioseismology with PICARD

TL;DR

This paper discusses the PICARD satellite's helioseismology program, which uses intensity images to study solar oscillations and mode amplification, contributing new observational data for solar physics research.

Contribution

It presents the first analyses and results of helioseismology data obtained from PICARD's SODISM telescope, including medium-$l$ and limb observations.

Findings

Detection of mode amplification near the solar limb

First helioseismology results from PICARD data

Insights into solar oscillation characteristics

Abstract

PICARD is a CNES micro-satellite launched in June 2010 (Thuillier at al. 2006). Its main goal is to measure the solar shape, total and spectral irradiance during the ascending phase of the activity cycle. The SODISM telescope onboard PICARD also allows us to conduct a program for helioseismology in intensity at 535.7 nm (Corbard et al. 2008). One-minute cadence low-resolution full images are available for a so-called medium-$l$ program, and high-resolution images of the limb recorded every 2 minutes are used to study mode amplification near the limb in the perspective of g-mode search. First analyses and results from these two programs are presented here.