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FANNING OUT OF THE SOLAR f-MODE IN THE PRESENCE OF NON-UNIFORM MAGNETIC FIELDS?
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
2014 (engelsk)Inngår i: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 795, nr 1, s. L8-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We show that in the presence of a magnetic field that is varying harmonically in space, the fundamental mode, or f-mode, in a stratified layer is altered in such a way that it fans out in the diagnostic k omega diagram, with mode power also within the fan. In our simulations, the surface is defined by a temperature and density jump in a piecewise isothermal layer. Unlike our previous work (Singh et al. 2014), where a uniform magnetic field was considered, here we employ a non-uniform magnetic field together with hydromagnetic turbulence at length scales much smaller than those of the magnetic field. The expansion of the f-mode is stronger for fields confined to the layer below the surface. In some of those cases, the k omega diagram also reveals a new class of low-frequency vertical stripes at multiples of twice the horizontal wavenumber of the background magnetic field. We argue that the study of the f-mode expansion might be a new and sensitive tool to determine subsurface magnetic fields with azimuthal or other horizontal periodicity.

sted, utgiver, år, opplag, sider
2014. Vol. 795, nr 1, s. L8-
Emneord [en]
magnetohydrodynamics (MHD), Sun: helioseismology, turbulence, waves
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-111933DOI: 10.1088/2041-8205/795/1/L8ISI: 000345455500008OAI: oai:DiVA.org:su-111933DiVA, id: diva2:777168
Merknad

AuthorCount:3;

Tilgjengelig fra: 2015-01-08 Laget: 2015-01-08 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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