Low-degree multi-spectral p-mode fitting

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Howe, R.^1 ; Broomhall, A.-M.^1,2,3 ; Chaplin, W.J.^1 ; Elsworth, Y.^1 ; Jain, K.^4

School of Physics and Astronomy, University of Birmingham, United Kingdom^1

Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom^2

Institute of Advanced Study, University of Warwick, Coventry, CV4 7AL, United Kingdom^3

National Solar Observatory, 950 N Cherry Ave., Tucson, AZ 85719, United States^4

关键词: Asymmetry parameter;    Helioseismic;    Imaging arrays;    Low degree;    Multi-spectral;    Multiple wavelengths;    Solar dynamics observatories;    Spherical harmonics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012011/pdf
DOI  :  10.1088/1742-6596/440/1/012011

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We combine unresolved-Sun velocity and intensity observations at multiple wavelengths from the Helioseismic and Magnetic Imager and Atmospheric Imaging Array onboard the Solar Dynamics Observatory to investigate the possibility of multi-spectral mode-frequency estimation at low spherical harmonic degree. We test a simple multi-spectral algorithm using a common line width and frequency for each mode and a separate amplitude, background and asymmetry parameter, and compare the results with those from fits to the individual spectra. The preliminary results suggest that this approach may provide a more stable fit than using the observables separately.