Simoniello, R., Finsterle, W., Garcia, R. A., Salabert, D., Jimenez, A., Elsworth, Y., et al. (2010). Acoustic power absorption and enhancement generated by slow and fast MHD waves Evidence of solar cycle velocity/intensity amplitude changes consistent with the mode conversion theory. Astronomy and Astrophysics, 516: A30. doi:10.1051/0004-6361/200913091.