Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994kofu.symp...71p&link_type=abstract
In: Proceedings of Kofu Symposium, Kofu, Japan, Sept. 6-10, 1993, p.71-74.
Physics
Scientific paper
During the past few years it has been suggested that the solar corona results from the superposition of a large number of tiny impulsive energy-release events, which have come to be known as ``nanoflares''. However, these events have not yet been observed; moreover, it remains to be shown theoretically that the repetitive occurrence of nanoflares can eventually build up a plasma at typical coronal densities and temperatures. The purpose of this work is to describe the temporal evolution of the plasma in a rigid, originally cool and nearly empty coronal flux tube with footpoints rooted in the chromosphere, when the flux tube is subject to the sporadic release of typical nanoflare energies. To this end, by analytically integrating the partial differential equations for mass, momentum, and energy conservation over the loop's spatial coordinate, we have developed a simple model involving only the spatial averages of the plasma thermodynamic variables. The model allows us to show how the repeated occurrence of low energy events in loops of different sizes eventually builds up a higher density, high temperature plasma - i.e., a nanoflare-heated corona. The observational consequences of our modeling, as well as future work in this area, are also discussed.
Kopp R.
Poletto Giannina
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