the lifetimes decrease as activity increases by about 13% between minimum and maximum. In quiet regions the lifetimes still decrease with solar activity but to a lesser extent (the lifetimes at solar maximum are about 8% of the lifetimes at solar minimum). This implies that the change to the damping is not just associated with the active regions that appear on the surface. In general p-mode linewidths increase with frequency, except for a plateau region at around $2800\,\rm\mu Hz$. @2000ApJ...543..472K found that the linewidths of modes in the plateau region were most sensitive to the level of solar activity.

Mode powers have been observed to decrease with increasing solar activity . The decrease in mode power is of the order of 20% and has been now been observed by many authors . The total energy of the mode, $E$, can be determined by multiplying the total power of the mode by the mode mass [as defined by @1991sia..book..401C]. The mode energy shows a similar decrease to the mode power, with a maximum to minimum variation of approximately 12% [@2002SoPh..209..247J].

The energy supply rate is determined by multiplying the mode energy by the mode width [e.g. @2000MNRAS.313...32C]. Numerous studies have shown 