Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/5251
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dc.contributor.authorRajaguru, S. P-
dc.contributor.authorWachter, R-
dc.contributor.authorSankarasubramanian, K-
dc.contributor.authorCouvidat, S-
dc.date.accessioned2010-09-23T13:17:01Z-
dc.date.available2010-09-23T13:17:01Z-
dc.date.issued2010-10-01-
dc.identifier.citationThe Astrophysical Journal, Vol.721, No. 2, pp. L86-L91en
dc.identifier.urihttp://hdl.handle.net/2248/5251-
dc.descriptionOpen Accessen
dc.description.abstractUsing a high-cadence imaging spectropolarimetric observation of a sunspot and its surroundings in magnetically sensitive (Fe I 6173 Å) and insensitive (Fe I 7090 Å) upper photospheric absorption lines, we map the instantaneous wave phases and helioseismic travel times as a function of observation height and inclination of magnetic field to the vertical. We confirm the magnetic inclination-angle-dependent transmission of incident acoustic waves into upward propagating waves and derive (1) proof that helioseismic travel times receive direction-dependent contributions from such waves and hence cause errors in conventional flow inferences, (2) evidences for acoustic wave sources beneath the umbral photosphere, and (3) significant differences in travel times measured from the chosen magnetically sensitive and insensitive spectral lines.en
dc.language.isoenen
dc.publisherIOP Publishingen
dc.relation.urihttp://dx.doi.org/10.1088/2041-8205/721/2/L86en
dc.rights© IOP Publishingen
dc.subjectRadiative transferen
dc.subjectSun: helioseismologyen
dc.subjectSun: oscillationsen
dc.subjectSun: surface magnetismen
dc.subjectSunspotsen
dc.titleLocal helioseismic and spectroscopic analyses of interactions between acoustic waves and a sunspoten
dc.typeArticleen
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