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Zbl 0959.35056
Khater, A.H.; Callebaut, D.K.; El-Kalaawy, O.H.
Bäcklund transformations and exact solutions for a nonlinear elliptic equation modelling isothermal magnetostatic atmosphere. (English)
[J] IMA J. Appl. Math. 65, No.1, 97-108 (2000). ISSN 0272-4960; ISSN 1464-3634/e

Summary: The equations of magnetostatic equilibria for a plasma in a gravitational field are investigated analytically. For equilibria with an ignorable spatial coordinate, the equations reduce to a single nonlinear elliptic equation for the magnetic potential $u$ known as the Grad-Shafranov equation. By specifying the arbitrary functions in this equation, a Liouville equation is obtained. Bäcklund transformations are described and applied to obtain exact solutions for the Liouville equation modelling an isothermal magnetostatic atmosphere, in which the current density $J$ is proportional to the exponential of the magnetic potential and moreover falls off exponentially with distance vertical to the base with an $e$-folding distance equal to the gravitational scale height.

MSC 2000:: *35J60 Nonlinear elliptic equations
86A25 Geo-electricity and geomagnetism
35Q60 PDE of electromagnetic theory and optics
35A05 General existence and uniqueness theorems (PDE)
76W05 Flows in presence of electromagnetic forces
35A30 Geometric theory for PDE, transformations

Keywords: magnetostatic equilibria; gravitational field; Liouville equation

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