Abstract
We compare the line profiles and frequencies of low ℓ=0, 1, 2 acoustic oscillations seen in observations in velocity (by the GOLF and GONG experiments) and in intensity (LOI instrument). Our study indicates that the systematic shift between the frequencies of low-ℓ pmodes in intensity and in velocity measurements recently discovered by Toutain and co-workers is merely an artifact of their reduction techniques. The results obtained agree perfectly with the theoretical expectation that solar oscillations are the global eigenmodes simultaneously visible in velocity and intensity with the frequencies and line profiles coinciding within the error bars.
Similar content being viewed by others
References
Appourchaux, T. et al.: 1999, in S. Korzennik (ed.), Structure and Dynamics of the Interior of the Sun and Sun-like Stars, ESA SP-418, p. 95.
Gavryusev, V. and Gavryuseva, E.: 1996, Astron. Astrophys. 310, 651.
Gavryusev, V. and Gavryuseva, E.: 1998a, in S. Korzennik (ed.), Structure and Dynamics of the Interior of the Sun and Sun-like Stars, ESA SP-418, p. 921.
Gavryusev, V. and Gavryuseva, E.: 1998b, in S. Korzennik (ed.), Structure and Dynamics of the Interior of the Sun and Sun-like Stars, ESA SP-418, p. 187.
Gavryusev, V. and Gavryuseva, E.: 1999, Monthly Notices Royal Astron. Soc. 303, L63.
Toutain, T., Appourchaux, T., Baudin, F., Fröhlich, C., Gabriel, A., Scherrer, P. et al.: 1997, Solar Phys. 175, 311.
Welch, P. D.: 1967, IEEE Trans., AU-15 2, 70.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gavryusev, V., Gavryuseva, E. On the difference between low-ℓ p-mode frequencies seen in velocity and in intensity. Solar Physics 189, 261–270 (1999). https://doi.org/10.1023/A:1005212125370
Issue Date:
DOI: https://doi.org/10.1023/A:1005212125370