Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..584s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 584-596.
Astronomy and Astrophysics
Astrophysics
106
Magnetic Flux, Solar Activity, Solar Atmosphere, Solar Magnetic Field, Stellar Models, Sunspots, Coronal Loops, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Magnetohydrodynamics, Solar Prominences
Scientific paper
The nonlinear undular mode of the magnetic buoyancy instability in an isolated horizontal magnetic flux embedded in a two-temperature layered atmosphere (solar corona-chromosphere/photosphere) is investigated using a two-dimensional magnetohydrodynamic code. The results show that the flux sheet with beta of about 1 is initially located at the bottom of the photosphere, and that the gas slides down the expanding loop as the instability develops, with the evacuated loop rising as a result of enhanced magnetic buoyancy. The expansion of the magnetic loop in the nonlinear regime displays self-similar behavior. The rise velocity of the magnetic loop in the high chromosphere (10-15 km/s) and the velocity of downflow noted along the loop (30-50 km/s) are consistent with observed values for arch filament systems.
Matsumoto Ryo
Shibata Kazunari
Steinolfson Richard S.
Tajima Toshiki
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