Transport of Magnetic Flux Along a Flux Rope Embedded in a Stratified Background Plasma With Horizontal Flows

Details Transport of Magnetic Flux Along a Flux Rope Embedded in a Stratified Background Plasma With Horizontal Flows Transport of Magnetic Flux Along a Flux Rope Embedded in a Stratified Background Plasma With Horizontal Flows

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0408c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0408

Physics

7522 Helioseismology, 7529 Photosphere

Scientific paper

A three-dimensional (3D) MHD simulation model of vertical, cylindrical magnetic flux rope embedded in a gravitationally stratified background plasma has been constructed. The initial flux rope consists of a current channel of finite radius and is in non-force-free equilibrium with pressure and constant downward gravity. The poloidal magnetic field is increased in time at the base of the simulation region. The focus of the study is to understand the resulting plasma dynamics inside and outside the current channel, corresponding to relatively low-beta and high-beta regions, respectively. Fluctuations in density are imposed, and horizontal flows from the side boundary are allowed. The poloidal flux injected from the base propagates upward and outward, developing highly incoherent structures due to both gravitational effects and the imposed noise. The role of magnetic reconnection in the evolution of the system is discussed. For comparison, similar simulations are carried out for the Gold-Hoyle flux rope. Possible observable manifestations of the transport of poloidal flux through the photosphere are discussed. Work supported by ONR

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