Abstract
Direct seismic imaging of subsurface flow, sound speed, and magnetic field is crucial for predicting flux-tube emergence on the solar surface, an important ingredient for space weather. The sensitivity of helioseismic mode-amplitude cross-correlation to p- and f-mode oscillations enables formal inversion of such subphotospheric perturbations. It is well known that such problems are written in the form of an integral equation that connects the perturbations to the observations via sensitivity kernels. While the sensitivity kernels for flow and sound speed have been known for decades and have been used extensively, formulating kernels for general magnetic perturbations had been elusive. A recent study proposed sensitivity kernels for Lorentz stresses corresponding to global magnetic fields of general geometry. The present study is devoted to proposing kernels for inferring Lorentz stresses as well as the solenoidal magnetic field in a local patch on the Sun via Cartesian mode coupling. Moreover, for the first time in solar physics, Slepian functions are employed to parameterize perturbations in the horizontal dimension. This is shown to increase the number of data constraints in the inverse problem, implying an increase in the precision of inferred parameters. This paves the path to reliably imaging subsurface solar magnetic features in, e.g., supergranules and (emerging) active regions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.