Local Probes of the Solar Interior
Abstract
Interest in local helioseismology has been growing as techniques have been developed to probe the solar interior in localized regions, rather than as global averages over the entire Sun. Three techniques have been developed so far - ring diagrams, time-distance, and Hilbert transforms. Ring diagrams (or plane-wave analysis) use three-dimensional Fourier transforms of remapped velocity data to infer properties below the observing area. Time-distance methods are closely related to terrestrial seismology techniques, and provide information about the conditions along a ray path. Hilbert transforms attempt to measure the instantaneous phase and amplitude of an acoustic wave across the solar surface. The status of the development of these methods along with their advantages, disadvantages, and application to solar data are reviewed.
- Publication:
-
Helioseismology
- Pub Date:
- 1995
- Bibcode:
- 1995ESASP.376a..63H
- Keywords:
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- Solar Interior: Helioseismology;
- Solar Interior: Methods of Observation