Solar cycle induced variations of the low L solar acoustic spectrum

Palle, P. L.; Regulo, C.; Roca-Cortés, T.
Referencia bibliográfica

Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. 253-258. Research supported by CICYT.

Fecha de publicación:
10
1989
Número de autores
3
Número de autores del IAC
3
Número de citas
92
Número de citas referidas
73
Descripción
Doppler velocity data are used to study solar cycle variation of the frequencies of solar acoustic oscillations from 1977 to 1988. The results show a clear shift in frequency of the cross-correlation peaks of -0.37 + or - 0.04 microHz peak to peak as the solar activity cycle progresses from maximum to minimum. This effect is dependent on the l value of the modes. The results suggest that, as low l modes penetrate deeply into the sun's interior, there are structural changes correlated with the solar activity cycle.