5.4 The SCLERA modes

Hill et al. (1982) derived splittings from the SCLERA low-frequency peaks, and from those inferred a core rotating at 6 times the surface rate; however, Woodard (1984) used ACRIM data to place an upper limit of 2.2 times the surface rate on the interior rotation rate, inconsistent with these splittings. Later, Hill (1985) identified low-degree rotational splittings in the five-minute band of the SCLERA acoustic spectrum, but Libbrecht (1986) and Brown et al. (1989Jump To The Next Citation Point) found that these results were inconsistent with the other evidence and were probably the result of misidentification of the modes. Given the complexity of the spectrum in question, whose derivation from measurements sampled at a few points on the solar limb made it difficult to separate out spectra of different degree, this seems a likely explanation.
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