Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..341h&link_type=abstract
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel
Astronomy and Astrophysics
Astrophysics
Scientific paper
"Funnels" are open structures connecting the lower transition region with the solar corona. We investigate the stationary plasma flow out of funnels with a flux tube model. The area-function is derived from an analytical 2-D magnetic field funnel model. Since the funnel height is only approximately 15 Mm, the area-function for greater heights is taken from the Banaszkiewicz et al. (1998) magnetic field model. Thus we obtain a realistic area-function up to the upper corona. The plasma within the funnel is treated with two-fluid equations including thermal conduction, electron-proton heat exchange, proton heating by cyclotron-damped Alfvén waves and Alfvén wave-pressure. We adjust the free parameters with quantities measured at the lower solar corona ~100 Mm above the photosphere) by SUMER aboard SOHO (Wilhelm et al., 1998). The thereby found height profiles of the plasma properties (e.g. density, electron and proton temperatures, flow speed) within the funnel are presented and partly compared with recent SUMER measurements.
Hackenberg Peter
Mann Gottfried
Marsch Eckart
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