254 citations · 1k across the 34 of their papers we have counts for
7 papers · 1 filter
Scattering of helioseismic waves by a sunspot: wavefront healing and folding
Z. -C. Liang, L. Gizon, H. Schunker
We observe and characterize the scattering of acoustic wave packets by a sunspot, in a regime where the wavelength is comparable to the size of the sunspot. Spatial maps of wave tr…
Local helioseismology and the active Sun
Hannah Schunker
The goal of local helioseismology is to elicit three-dimensional information about the sub-surface (or far-side) structure and dynamics of the Sun from observations of the heliosei…
Acoustic power absorption and enhancement generated by slow and fast MHD waves
R. Simoniello, W. Finsterle, R. A. Garcia +4
We used long duration, high quality, unresolved (Sun-as-a star) observations collected by the ground based network BiSON and by the instruments GOLF and VIRGO on board the ESA/NASA…
Constructing semi-empirical sunspot models for helioseismology
R. Cameron, L. Gizon, H. Schunker +1
One goal of helioseismology is to determine the subsurface structure of sunspots. In order to do so, it is important to understand first the near-surface effects of sunspots on sol…
Surface magnetic field effects in local helioseismology
H. Schunker, D. C. Braun, P. S. Cally
Using helioseismic holography strong evidence is presented that the phase (or equivalent travel-time) of helioseismic signatures in Dopplergrams within sunspots depend upon the lin…
Helioseismology of Sunspots: A Case Study of NOAA Region 9787
L. Gizon, H. Schunker, C. S. Baldner +12
Various methods of helioseismology are used to study the subsurface properties of the sunspot in NOAA Active Region 9787. This sunspot was chosen because it is axisymmetric, shows…