Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1817m&link_type=abstract
American Astronomical Society, SPD meeting #42, #18.17; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We studied over 200 closed field lines from a realistic FF field in the neighborhood of a sunspot group. Each field line can be perceived as a coronal loop with plasma density and temperature profiles when appropriate heating and radiative cooling are applied. These field lines have a variety of properties, including spatially varying flux tube area and the geometric shape that determines gravity projection. As a result, we see a large range of loop behaviors. Some reach a static equilibrium. Some reach a steady state with a one-way siphon flow. However, most of them do not reach a steady state. Their temperature/density oscillate in time between a hot phase and a cool phase periodically, with approximately 90 degrees phase difference between temperature and density. By artificially modifying their geometric properties and/or heating, we show that we can alter their behaviors, for example, from an oscillating type to a steady-state type. Our study underscores the importance of using the correct geometry when using 1D simulation to model coronal loops.
Linker Jon
Lionello Roberto
Mikic Zoran
Mok Yung
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