Turbulence, Particle Acceleration, and Heating Due To the Lower Hybrid Mode Near Magnetic Reconnection Regions in Magnetopause

Abstract

AbstractMMS mission by NASA has observed lower hybrid waves (LHWs) and associated turbulence near the reconnection regions at Earth's magnetopause. The presented work studies LHWs (electromagnetic mode) and turbulence in the presence of magnetic islands (at the reconnection sites) in magnetopause. A nonlinear model representing electromagnetic 3D LHW has been developed. We have considered that nonlinear effects are due to the ponderomotive force. The dynamical equation, thus obtained, is solved using numerical methods and computer simulation. For spatial integration, we have used the pseudo‐spectral method and the finite difference method is used to study temporal evolution. The simulation results show the spatiotemporal development of the LHW localized structures and current sheets and confirm the presence of turbulence. Using a semi‐analytic model, we have determined the scale size of current sheets and localized structures and shown that these scale sizes depend upon the lower hybrid power. The turbulent power spectra have also been studied. The power scaling of k−2.8 (approximately) and k−2.1 (approximately) are observed along perpendicular and parallel directions, respectively. The power law scaling of turbulence generation has been used to study the formation of the thermal tail of energetic electrons. The fractional diffusion method has also been exploited to determine electron acceleration and plasma heating. We anticipate LHW may be responsible for the acceleration of the energetic electrons and anomalous heating in magnetopause.