Please use this identifier to cite or link to this item:
http://hdl.handle.net/2248/5251
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Rajaguru, S. P | - |
dc.contributor.author | Wachter, R | - |
dc.contributor.author | Sankarasubramanian, K | - |
dc.contributor.author | Couvidat, S | - |
dc.date.accessioned | 2010-09-23T13:17:01Z | - |
dc.date.available | 2010-09-23T13:17:01Z | - |
dc.date.issued | 2010-10-01 | - |
dc.identifier.citation | The Astrophysical Journal, Vol.721, No. 2, pp. L86-L91 | en |
dc.identifier.uri | http://hdl.handle.net/2248/5251 | - |
dc.description | Open Access | en |
dc.description.abstract | Using 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.iso | en | en |
dc.publisher | IOP Publishing | en |
dc.relation.uri | http://dx.doi.org/10.1088/2041-8205/721/2/L86 | en |
dc.rights | © IOP Publishing | en |
dc.subject | Radiative transfer | en |
dc.subject | Sun: helioseismology | en |
dc.subject | Sun: oscillations | en |
dc.subject | Sun: surface magnetism | en |
dc.subject | Sunspots | en |
dc.title | Local helioseismic and spectroscopic analyses of interactions between acoustic waves and a sunspot | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Local helioseismic and spectroscopic analyses | Open Access | 543.25 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.