Study On The Rising Tone Emission In The Inner Magnetosphere By Using The Nonlinear Wave Growth Theory

In the inner magnetosphere,there are various kinds of plasma waves.These waves mainly include EMIC waves,chorus waves and hiss waves,which can cause pitch angle scattering and energy variation of charged particles through resonant interaction with them.Wave-particle interaction is an important physical mechanism leading to the dynamic evolution of the inner magnetosphere.Therefore,it is necessary to study the excitation process of various plasma waves.In the thesis,we systematically investigate the rising tone EMIC waves,chorus waves and hiss waves in the Earth's radiation belt by using the latest observations of RBSP satellite.The excitation processes of the three kinds of waves are calculated by using the corresponding nonlinear wave growth models.For the first time we simulate the nonlinear wave growth of the rising tone EMIC waves in the He~+band.The simulation results are in good agreement with the observations indicating that the rising tone EMIC waves can be excited near the equatorial region.We analyze the rare EMIC waves occurring outside the plasmapause.According to the results of nonlinear wave growth simulation,this event is identified being excited at the satellite's local location.In addition,satellite observation show that the rising tone EMIC waves excitation is associated with the simultaneous presence of higher flux of several keV to several tens of keV energy protons with90~o pitch angle and low energy protons below 100 eV.For rising tone chorus waves,a large number of hot electrons appear with perpendicular temperature larger than the parallel temperature,indicating that the waves are excited by the temperature anisotropy of hot electrons.The acceleration efficiency of rising tone chorus waves for MeV energy electrons is greater than tens to hundreds of keV energy electrons.In the nonlinear wave growth model of the chorus waves,the actual calculated value of the spatial inhomogeneity of the static magnetic field,rather than the empirical value commonly used in the past,can greatly improve the consistency of fit between the simulation result and the satellite observation value.The reasonable results of the BWO model for calculating the sweep frequency of the chorus show that a step-like deformation function of the energetic electrons in field-aligned velocities can excite the chorus waves.When a large number of hot electrons are injected into the inner magnetosphere,the intensity of the hiss waves is significantly enhanced.The good agreement between the nonlinear wave growth simulation results of the hiss waves and the satellite observations shows that the hiss waves can be generated by nonlinear self-excitation.This work systematically studied three typical rising tone fluctuations in the inner magnetosphere and a large number of new satellite observations are analyzed,which should be helpful to understand the process of nonlinear wave excitation in the inner magnetosphere.