Confirmation of solar cycle-dependent intermediate-degree p-mode frequency shifts
Jr. Rhodes E. J.California Univ. Santa Barbara; Southern California Univ., Los Angeles; JPL, Pasadena, CA, United StatesA. CaccianiS. G. KorzennikJet Propulsion Lab. California Inst. of Tech., Pasadena, CA, United StatesR. K. UlrichCalifornia, University Los Angeles, United States
1993en
ABI
Abstract
Results of intercomparisons of seven different sets of frequencies of intermediate-degree p-modes obtained at several different locations between 1981 and 1989 are presented. It is shown that the frequency shifts exhibited by all of these intermediate-degree p-modes are consistent with the intermediate-degree frequency shifts presented by Libbrecht and Woodward (1990) and also with the low-degree frequency shifts presented by Elsworth et al. (1990). It is also shown that these frequency shifts correlate with solar cycle-dependent changes in sunspot number, area, and irradiance. Unbinned and binned differences between 1984 Mount Wilson Observatory and revised 1981 South Pole frequencies are illustrated.
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