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On the identification of normal modes of oscillation from observations of the solar peripheryThe 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 is 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. A procedure was 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.
Document ID
19840021775
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gough, D. D. (Cambridge Univ. Cambridge, United Kingdom)
Latour, J. (Observatoires du Pic-du-Midi)
Date Acquired
September 4, 2013
Publication Date
January 1, 1984
Subject Category
Solar Physics
Report/Patent Number
NASA-CR-173667
NAS 1.26:173667
Accession Number
84N29844
Funding Number(s)
CONTRACT_GRANT: NAGW-91
CONTRACT_GRANT: NSG-7511
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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