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Spherical harmonic analysis of steady photospheric flows (1987)

Hathaway, David H.

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Publication Date: 2011-08-19

Description: A technique is presented in which full disk Doppler velocity measurements are analyzed using spherical harmonic functions to determine the characteristics of the spectrum of spherical harmonic modes and the nature of steady photospheric flows. Synthetic data are constructed in order to test the technique. In spite of the mode mixing due to the lack of information about the motions on the backside of the sun, solar rotation and differential rotation can be accurately measured and monitored for secular changes, and meridional circulations with small amplitudes can be measured. Furthermore, limb shift measurements can be accurately obtained, and supergranules can be fully resolved and separated from giant cells by their spatial characteristics.

Keywords: SOLAR PHYSICS

Type: Solar Physics (ISSN 0038-0938); 108; 1, 19

Format: text

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