Open AccessAnomalous variations in low‐degree helioseismic mode frequencies
Author(s) -
Howe R.,
Chaplin W. J.,
Elsworth Y.,
Hill F.,
Komm R. W.,
Isaak G. R.,
New R.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10346.x
Subject(s) - physics , helioseismology , degree (music) , astrophysics , doppler effect , oscillation (cell signaling) , spectral line , mode (computer interface) , stars , standard solar model , computational physics , astronomy , acoustics , quantum mechanics , genetics , operating system , biology , magnetic field , computer science , neutrino oscillation , solar neutrino , neutrino
We compare changes in the frequencies of solar acoustic modes with degree between 0 and 2, as derived from Global Oscillation Network Group (GONG), Birmingham Solar Oscillations Network (BiSON) and Michelson Doppler Imager (MDI) spectra obtained between 1995 and 2003. We find that, after the solar‐activity dependence has been removed from the frequencies, there remain variations that appear to be significant, and are often well correlated between the different data sets. We consider possible explanations for these fluctuations, and conclude that they are likely to be related to the stochastic excitation of the modes. The existence of such fluctuations has possible relevance to the analysis of other low‐degree acoustic mode spectra such as those from solar‐type stars.