Y. Elsworth et al., THE VARIATION IN THE STRENGTH OF LOW-L SOLAR P-MODES - 1981-92, Monthly Notices of the Royal Astronomical Society, 265(4), 1993, pp. 888-898
The acoustic eigenmodes of the Sun are a well-recognized probe of the
structure of the solar interior. We report here on a measurement of th
e strength of the low-l p-mode oscillations throughout a solar cycle.
There is an increase of 35 +/- 5 per cent in the strength of the modes
from solar maximum to solar minimum, consistent for all the l-values
measured. The observations were made with the Birmingham Solar Oscilla
tions Network ('BISON').