On the identification of normal modes of oscillation from observations of the solar periphery

Details On the identification of normal modes of oscillation from observations of the solar periphery On the identification of normal modes of oscillation from observations of the solar periphery

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aexpr...1....9g&link_type=abstract

Astronomy Express (ISSN 0265-5365), vol. 1, July 1984, p. 9-24.

Astronomy and Astrophysics

Astronomy

3

Solar Oscillations, Vibration Mode, Legendre Functions, Limb Darkening, Power Spectra, Spatial Distribution, Spatial Resolution, Temporal Distribution

Scientific paper

The decomposition of solar oscillations into their constituent normal modes requires a knowledge of both the spatial and temporal variation of the perturbation to the sun's surface. The task can be especially difficult when only limited spatial information is available. Observations of the limb-darkening function, for example, are probably sensitive to too large a number of modes to permit most of the modes to be identified in a power spectrum of measurements at only a few points on the limb, unless the results are combined with other data. In this paper a procedure is considered by which the contributions from quite small groups of modes to spatially well resolved data obtained at any instant can be extracted from the remaining modes. Combining these results with frequency information then permits the modes to be identified, at least if their frequencies are low enough to ensure that modes of high degree do not contribute substantially to the signal.

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