Observation of, and variations in, multiplet frequency asymmetries at low l

Details Observation of, and variations in, multiplet frequency asymmetries at low l Observation of, and variations in, multiplet frequency asymmetries at low l

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508...71c&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Computer Science

Solar Activity, Acoustic Frequency Shift

Scientific paper

The predominant contribution to the frequency splitting of low-l solar p modes arises from the rotation of the solar interior and this lifts the frequency degeneracy in l to give a symmetric pattern where the observed (synodic) separation between adjacent m (i.e., for |Δm| = 1) is ~400nHz. Magnetic fields can also contribute to the splitting, but they do so in such a way as to introduce asymmetries in the arrangement of the components within each multiplet. In full-disc data this effect may become apparent when l >= 2. Here, we extract estimates of the frequency asymmetry for l = 2, investigate variations over the activity cycle and compare the results with the near-surface predictions of Dziembowski et al. (2000) which are based upon observations from higher l.

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