The magnetism of the solar interior for a complete MHD solar vision

TL;DR

This paper discusses the evolving understanding of solar magnetism, emphasizing the importance of internal magnetic fields, and outlines a roadmap of upcoming missions and technologies aimed at achieving a comprehensive MHD model of the Sun.

Contribution

It proposes a strategic plan combining current and future space missions to enhance our understanding of the Sun's internal magnetic fields and their impact on solar activity.

Findings

Internal solar magnetism is crucial for understanding solar cycles.

Upcoming missions will improve gravity mode detection.

A comprehensive MHD solar model is a long-term goal.

Abstract

The solar magnetism is no more considered as a purely superficial phenomenon. The SoHO community has shown that the length of the solar cycle depends on the transition region between radiation and convection. Nevertheless, the internal solar (stellar) magnetism stays poorly known. Starting in 2008, the American instrument HMI/SDO and the European microsatellite PICARD will enrich our view of the Sun-Earth relationship. Thus obtaining a complete MHD solar picture is a clear objective for the next decades and it requires complementary observations of the dynamics of the radiative zone. For that ambitious goal, space prototypes are being developed to improve gravity mode detection. The Sun is unique to progress on the topology of deep internal magnetic fields and to understand the complex mechanisms which provoke photospheric and coronal magnetic changes and possible longer cycles important for human life. We propose the following roadmap in Europe to contribute to this "impressive" revolution in Astronomy and in our Sun-Earth relationship: SoHO (1995-2007), PICARD (2008-2010), DynaMICS (2009-2017) in parallel to SDO (2008-2017) then a world-class mission located at the L1 orbit or above the solar poles.