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The effect of time-dependent γ-pumping on buoyant magnetic structures

Abrar, A. A. and Silvers, L. J. ORCID: 0000-0003-0619-6756 (2018). The effect of time-dependent γ-pumping on buoyant magnetic structures. Geophysical and Astrophysical Fluid Dynamics, doi: 10.1080/03091929.2018.1537396

Abstract

In this paper, we explore for the first time the interactions of the net downward, time-dependent, γ-pumping overlying an imposed layer of magnetic fluid, in a polytropic atmosphere. Our calculations show that an equipartition of energy, between the magnetic and kinetic components, must be reached for buoyancy-driven magnetic structures to rise into the pumping region. However, structures do not rise unhindered, as in a previous investigation. We show that the evolution and other features of the emerging magnetic flux structures are significantly affected by the temporal variation of the γ-pumping. The rate of emerging structures, the strength of magnetic concentrations and the extent to how far magnetic field can travel were all found to depend on the timescale of the γ-pumping.

Publication Type: Article
Publisher Keywords: Convection, instabilities, MHD, sun: interior, sun: magnetic fields
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Mathematics, Computer Science & Engineering > Mathematics
URI: http://openaccess.city.ac.uk/id/eprint/20830
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