TY - JOUR
T1 - Analyzing Supergranular Power Spectra Using Helioseismic Normal-mode Coupling
AU - Hanson, Chris S.
AU - Hanasoge, Shravan
AU - Sreenivasan, Katepalli R.
N1 - Funding Information:
The authors downloaded HMI data from the German Data Center at the Max Planck Institute for Solar System Research. The Center for Space Science at NYU Abu Dhabi is funded by NYUAD Institute Grant G1502. The HMI data are courtesy of NASA/SDO and the HMI Science Team. Processing of HMI data was performed on the DALMA compute cluster at NYUAD.
Publisher Copyright:
© 2021. The American Astronomical Society. All rights reserved.
PY - 2021/4/1
Y1 - 2021/4/1
N2 - Normal-mode coupling is a technique applied to probe the solar interior using surface observations of oscillations. The technique, which is straightforward to implement, makes more use of the seismic information in the wave field than other comparable local imaging techniques and therefore has the potential to significantly improve current capabilities. Here, we examine supergranulation power spectra using mode-coupling analyses of intermediate-to-high-degree modes by invoking a Cartesian-geometric description of wave propagation under the assumption that the localized patches are much smaller in size than the solar radius. We extract the supergranular power spectrum and compare the results with prior helioseismic studies. Measurements of the dispersion relation and lifetimes of supergranulation, obtained using near surface modes (f and p 1), are in accord with the literature. We show that the cross-coupling between the p 2 and p 3 acoustic modes, which are capable of probing greater depths, are also sensitive to supergranulation.
AB - Normal-mode coupling is a technique applied to probe the solar interior using surface observations of oscillations. The technique, which is straightforward to implement, makes more use of the seismic information in the wave field than other comparable local imaging techniques and therefore has the potential to significantly improve current capabilities. Here, we examine supergranulation power spectra using mode-coupling analyses of intermediate-to-high-degree modes by invoking a Cartesian-geometric description of wave propagation under the assumption that the localized patches are much smaller in size than the solar radius. We extract the supergranular power spectrum and compare the results with prior helioseismic studies. Measurements of the dispersion relation and lifetimes of supergranulation, obtained using near surface modes (f and p 1), are in accord with the literature. We show that the cross-coupling between the p 2 and p 3 acoustic modes, which are capable of probing greater depths, are also sensitive to supergranulation.
UR - http://www.scopus.com/inward/record.url?scp=85104666611&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85104666611&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/abe770
DO - 10.3847/1538-4357/abe770
M3 - Article
AN - SCOPUS:85104666611
VL - 910
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 156
ER -