Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..136..303t&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 136, Dec. 1991, p. 303-316.
Physics
5
Conductive Heat Transfer, Coronal Loops, Plasma Waves, Solar Corona, Transient Heating, Digital Simulation, Electric Current, Electron Plasma, Solar Flares
Scientific paper
Numerical simulation is made of the transient heat conduction during local heating in a model coronal magnetic loop with an axial electric current. It is assumed that a segment near the top of the normal coronal loop is heated to above 10 exp 7 K by a sufficiently small heat input as compared with the total flare energy. A hump appears in the velocity distribution of electrons moving down the temperature gradient with speeds slightly below the thermal one. Consequently, electron plasma waves are excited. The high intensity of the waves persists in the upper region of the loop for more than a second until the termination of the simulation. The energy density of the plasma waves normalized with respect to thermal density is 10 exp -3.5 at maximum. A theoretical estimate gives an anomalous resistivity five orders of magnitude greater than an initial value. Based on the above result, a model for impulsive loop flares is proposed.
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