A model of impulsive loop flares revisited

Physics

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Conductive Heat Transfer, Electrical Resistivity, Electron Distribution, Electron Energy, Electron Plasma, Ion Acoustic Waves, Ion Cyclotron Radiation, Proton Energy, Solar Flares, Stellar Models, Magnetohydrodynamic Stability, Ratios, Satellite-Borne Instruments, Solar Corona

Scientific paper

A critical examination of the components of the recent/impulsive loop flare model of Takakura is made. It is found that his analysis of the stability of the electron distribution resulting from anomalous heat conduction is in error and electron plasma waves would not be excited. Rather, in the regions where the electron/proton temperature ratio Te/Ti is less than or approximately equal to 10, electrostatic ion-cyclotron waves would be excited and in the regions where Te is greater than or approximately equal to 10, ion-acoustic waves would be excited. Ratios of Te/Ti is greater than or approximately equal to 10 occur only in the late time development behind the conduction fronts. Since the anomalous resistivity due to electrostatic ion-cyclotron waves is fortuitously about 70% of the one used by Takakura, the general development will follow closely the one calculated by him. Because the anomalous resistivity due to ion-acoustic waves is about 95 times the one used by Takakura, the development in the parts of the loop where Te/Ti is greater than or approximately equal to 10 for late times would be altered considerably.

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