Instability Conditions of Ion-Acoustic Oscillations in the Transition Region and Lower Solar Corona

Abstract

The preconditions for the formation of electron temperature jumps with scales comparable to the mean free path of electrons in the solar atmosphere are examined. In regions with heat flux, noise electric fields can arise due to ion-acoustic plasma turbulence. The well-known experimental data on heat flux from the corona to the chromosphere are used to calculate the height dependences of the threshold conditions for the occurrence of ion-acoustic instability. The calculations are conducted on the basis of well-known experimental data.