Expansion Process of Emerging Flux Tube

Details Expansion Process of Emerging Flux Tube Expansion Process of Emerging Flux Tube

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0134m&link_type=abstract

American Astronomical Society, SPD Meeting #31, #01.34; Bulletin of the American Astronomical Society, Vol. 32, p.1289

Astronomy and Astrophysics

Astronomy

Scientific paper

In this poster, we discuss the evolution of flux tube rising from the upper convection zone to the lower corona. A straight horizontal flux tube is initially located in a weakly superadiabatic layer. The tube later starts rising under the magnetic buoyancy force. This process is investigated by performing 2D MHD numerical simulations. We show some numerical simulation results and explain these in terms of basic physical mechanisms including the Rayleigh-Taylor and Parker instabilities. Since the pressure scale height around the photosphere is small, the so-called thin flux tube approximation becomes less effective when we discuss the detailed behaviors of emerging flux tube. A full 2-dimensional MHD dynamical simulation clearly shows us how the cross section of a flux tube deforms during its emergence. One observational prediction is that flux tube below a critical size will be blocked from emerging through the photosphere.

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