Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh41a1614s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH41A-1614
Physics
7509 Corona, 7524 Magnetic Fields
Scientific paper
The solar corona has million degree temperature even though it is located above the cooler chromosphere and the photosphere. Also, coronal plasma is constantly flowing out as the solar wind. So the mechanism of coronal heating needs to include a mechanism of constant plasma supply. Most of the proposed coronal heating mechanisms are by waves or nano-flares. Both mechanisms are to carry energy of photospheric convection motion into the corona and dissipate there. Plasma supply is assumed to be through evaporation (or ablation) from the lower atmosphere due to steep temperature gradient. In these mechanisms, tenuous coronal plasma receives large amount of energy to heat and evaporate low temperature plasma into the corona. Hence the temperature of the initially heated plasma should be much higher than the million degree corona. Charged particles with such high temperature in the tenuous corona cannot reach the lower atmosphere due to their strong diamagnetic moment. They will be pushed upwards where magnetic field is weak rather than downwards where magnetic field is strong. Hence, the evaporation mechanism will not work. I will propose a quite different mechanism of million-degree plasma supply in more direct manner. The solar corona is filled with magnetic fields. They are generated at the base of the convection zone and lifted by the convection motion. The standard model of the Sun shows that the temperature at the base of the convection zone is about 2 million degree. So the plasmas trapped in the magnetic flux tube must have temperature there. Plasma particles have diamagnetic moments and they will be pushed along the flux tube toward weaker magnetic field region. As the result, the solar atmosphere which is filled with magnetic field, generated at the base of the convection zone, must have million degree temperature.
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