WP4 – Helioseismology

 A stand-alone website with many tools, data and outreach material regarding helioseismology, focused on the goals of SpaceInn,  is available here

The objectives of the SpaceInn WP4 – Helioseismology are the following:

Global helioseismology:

• Combine core competences of involved research groups and institutions to maximize the scientific exploitation of the existing helioseismic data archives from ground-based facilities and space missions.
• Develop new tools to extract global seismic parameters of HMI and AIA aboard the NASA mission SDO.
• Develop advanced statistical tools to extract the common information of contemporary datasets.
• To generate two novel solar magnetic activity proxies based on GOLF and VIRGO measurements using the luminosity variations and velocity perturbations induced by the active regions crossing the visible surface of the Sun.
• Compare the rising phases of solar Schwabe cycles 22, 23 and the current cycle 24, to uncover possible differences during this phase after the unusual behaviour of the Sun during the last magnetic-activity minimum.
• Push forward the present barriers of our knowledge by developing more realistic structure and evolution models of the Sun as well as performing state-of-the-art 3D simulations to understand the physical mechanisms at the origin of the solar differential rotation and meridional flows.

Local helioseismology:

• Carry out activities that will push the frontiers of space-based local helioseismology leading to innovative and reliable science data products.
• Document and study systematic errors present in local helioseismology data (MDI, GONG, HMI), due to geometrical and instrumental effects, and misinterpretation.
• Make available and use numerical simulations to study these systematics and to study the seismic signature of magnetic fields.
• Explore ways to extend local helioseismology analyses to higher heliographic latitudes, greater depths, and magnetized regions, with a higher level of confidence.
• Develop fast, automated data processing to push the focus to innovative techniques of local helioseismology (e.g., Fourier-Hankel).

Exploitation of Space Data for Innovative Helio- and Asteroseismology