Main Objective:
Analysis of the effects of inclined magnetic fields on different convective modes.
Scientific Justification:
The influence of inclined magnetic fields on convection was derived by Chandrasekhar (1961, Hydrodynamic and hydromagnetic stability); he showed that the convection mode is sensitive to the vertical magnetic field (Bver), whereas the convective cells' shape is sensitive to the horizontal component (Bhor). Gough & Tayler (1966) described the role of Bver in the convective instability criterion.
A constant value of the vertical magnetic field (Bcrit) was found in a statistical analysis of umbra-penumbra boundaries of stable sunspots (Jurcak et al. 2018). This study and previous studies (Jurcak 2011; Jurcak et al. 2015; Jurcak et al. 2017) lead to the formulation of Jurcak criterion, an empirical law stating that the umbral boundary of stable sunspots can be equivalently defined by a continuum intensity or a vertical magnetic field component |Bver|. In other words, in areas with |Bver| > Bcrit , only the umbral mode of convection exists, hindering other modes of magneto-convection. A conjecture can also be stated from these findings: umbral areas with |Bver| < Bcrit are unstable against more vigorous modes of convection, that is, they are prone to vanish (Schamssmann et al. 2018).
We aim to study inclined magnetic fields on different convective modes and analyse their influence. |
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