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Phase differences between luminosity and velocity measurements of the acoustic modes |
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| Authors: | A Jiménez M Álvarez N B Andersen V Domingo A Jones P L Pallé T Roca Cortés |
| Institution: | (1) Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain;(2) Space Science Department of ESA, ESTEC, Noorwijk, the Netherlands;(3) Instituto de Astronomía, Observatorio Astronómico Nacional, Ensenada, Baja California, México;(4) Present address: Norsk Romsenter, Norwegian Space Centre, Oslo, Norway |
| Abstract: | With two photometric stations (Tenerife and Baja California) the luminosity p-mode spectrum at different wavelengths has been identified. After a coherence analysis between data from both stations to verify the solar origin of the peaks identified in luminosity, a comparative study with simultaneous velocity measurements (obtained at Tenerife only) has also been made. As a result the frequency dependence of the phase difference between luminosity and velocity p-modes has been obtained that is interpreted in terms of a nonadiabatic behaviour of the solar atmosphere. The amplitude ratios between luminosity and velocity p-modes have also been obtained. All these results are compared with theoretical expectations. |
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