Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..731h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 20, 1992, p. 731-738.
Astronomy and Astrophysics
Astrophysics
42
Chromosphere, Magnetohydrodynamic Waves, Shock Wave Interaction, Solar Corona, Stellar Magnetic Fields, Computerized Simulation, Magnetic Flux, Photosphere, Stellar Models
Scientific paper
The nonlinear evolution of an Alfvenic impulse launched from the photosphere and its dynamical effects on the chromosphere, transition region (TR), and corona are investigated using a simple 1D model. It is found that the leading edge of the torsional pulse can steepen into a fast shock in the chromosphere if the pulse is of sufficiently large amplitude and short duration. A slow shock which develops behind the Alfvenic pulse can reflect downgoing Alfven waves back up to the corona. The upgoing reflected wave can induce a significant upward ejection of the TR. Nonlinear dynamics are found to lead to very impulsive behavior at later times. It is suggested that impulsive events occurring in the TR or corona need not be interpreted in terms of reconnection-driven microflares. It is also found that B(0) in the chromosphere can be amplified when the TR and chromosphere fall.
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