Sc. Tripathy et al., Observation of hysteresis between solar activity indicators and p-mode frequency shifts for solar cycle 22, J ASTROPHYS, 21(3-4), 2000, pp. 357-360
Using intermediate degree p-mode frequency data sets for solar cycle 22, we
find that the frequency shifts and magnetic activity indicators show a "hy
steresis" phenomenon. It is observed that the magnetic indices follow diffe
rent paths for the ascending and descending phases of the solar cycle while
for radiative indices, the separation between the paths are well within th
e error limits.