Ray Tracing of MHD Rossby Waves in the Solar Tachocline: Meridional Propagation and Implications for the Solar Magnetic Activity

Autor(es)

Teruya, Andre S. W. ; Raphaldini, Breno ; Raupp, Carlos F. M.

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN ASTRONOMY AND SPACE SCIENCES; v. 9, p. 10-pg., 2022-05-05.

Resumo

Rossby waves have been recently recognised for their role in the large-scale spatio-temporal organisation of the solar magnetic activity. Here, we study the propagation of magnetohydrodynamic Rossby waves in a thin layer, representing the solar tachocline. We consider the waves embedded in a meridionally varying background state characterised by a mean zonal flow, which mimics the differential rotation profile of the Sun, and a toroidal magnetic field. Two anti-symmetric toroidal magnetic fields are utilised: one having a global structure with the maximum at around 50(o) and the other characterised by a narrow band centered at around 20(o). We show that for a global structure toroidal magnetic field, the MHD Rossby modes undergo significant meridional propagation, either equatorward or poleward. In addition, the latitude where the waves exhibit a stationary behaviour is sensitive to the strength of the background magnetic field. On the other hand, a narrow band toroidal magnetic field is shown to work as a waveguide for the fast branch of MHD Rossby waves. (AU)

• Processo FAPESP: 20/14162-6 - Influência da convecção úmida no problema do ajuste geostrófico no plano beta equatorial
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