Validation of super thermal electron induced by nth gyro-harmonic frequency heating

When the gyro-harmonic heating and some other instability happen at the same time, several instabilities interact with each other, which is easier for them to ionize neural gas. It is represented as the huge enhancement of the electron density amplitude, and the scale of enhancement will extend to several hundreds kilometers. Base on the observation results of the heating experiment in polar region, the super thermal electron induced by nth gyro-harmonic frequency heating is validated and the relevant physical process is explained.