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Resonant origin for density fluctuations deep within the Sun: helioseismology and magneto-gravity waves

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Resonant origin for density fluctuations deep within the Sun: helioseismology and magneto-gravity waves

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dc.contributor.author	Burgess, C. P.
dc.contributor.author	Dzhalilov, N. S.
dc.contributor.author	Rashba, Timur I.
dc.contributor.author	Semikoz, Victor B.
dc.contributor.author	Furtado Valle, José Wagner
dc.date.accessioned	2015-09-30T12:17:09Z
dc.date.available	2015-09-30T12:17:09Z
dc.date.issued	2004
dc.identifier.citation	Burgess, C. P. Dzhalilov, N. S. Rashba, Timur I. Semikoz, Victor B. Furtado Valle, José Wagner 2004 Resonant origin for density fluctuations deep within the Sun: helioseismology and magneto-gravity waves Monthly Notices of the Royal Astronomical Society 348 2 609 624
dc.identifier.uri	http://hdl.handle.net/10550/47504
dc.description.abstract	We analyze helioseismic waves near the solar equator in the presence of magnetic fields deep within the solar radiative zone. We find that reasonable magnetic fields can significantly alter the shapes of the wave profiles for helioseismic g-modes. They can do so because the existence of density gradients allows g-modes to resonantly excite Alfven waves, causing mode energy to be funnelled along magnetic field lines, away from the solar equatorial plane. The resulting wave forms show comparatively sharp spikes in the density profile at radii where these resonances take place. We estimate how big these waves might be in the Sun, and perform a first search for observable consequences. We find the density excursions at the resonances to be too narrow to be ruled out by present-day analyses of p-wave helioseismic spectra, even if their amplitudes were to be larger than a few percent. (In contrast it has been shown in (Burgess et al. 2002) that such density excursions could affect solar neutrino fluxes in an important way.) Because solar p-waves are not strongly influenced by radiative-zone magnetic fields, standard analyses of helioseismic data should not be significantly altered. The influence of the magnetic field on the g-mode frequency spectrum could be used to probe sufficiently large radiative-zone magnetic fields should solar g-modes ever be definitively observed. Our results would have stronger implications if overstable solar g-modes should prove to have very large amplitudes, as has sometimes been argued.
dc.language.iso	eng
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society, 2004, vol. 348, num. 2, p. 609-624
dc.subject	Física
dc.title	Resonant origin for density fluctuations deep within the Sun: helioseismology and magneto-gravity waves
dc.type	journal article	es_ES
dc.date.updated	2015-09-30T12:17:09Z
dc.identifier.doi	10.1111/j.1365-2966.2004.07392.x
dc.identifier.idgrec	018331
dc.rights.accessRights	open access	es_ES