太空電漿環境中之磁重連與電漿不穩定的觀測與理論研究(2/3)

This midterm report gives a summary of the researchactivities and results accomplished during the periods of2022/8 – 2023/5 for a three-year project entitled“Magnetic reconnection and plasma instability in spaceplasma environments: observation and theory”. In thesecond year we continue the study on plasma mirrorinstability and magnetic reconnection occurring in themagnetospheric environments by analyzing the highresolution MMS spacecraft data along with the kinetic andfluid theories of magnetized plasmas. In particular, wehave examined the mirror instability based on the kineticparticle simulations and compared the results to the linearkinetic theory and spacecraft observations of mirror waves.We have found that in the kinetic simulations thethermodynamic laws possess the form of double-polytropiclaws with the thermodynamic exponents being functions ofplasma betas and propagation angles and the phase relationsare consistent with the theoretical predictions and theobservations. For the magnetic reconnection problem we haveidentified more observational events occurring at themagnetopause with the features of mirror waves. In additionwe have developed the theoretical models for theelectrostatic acoustic solitons in general nonthermalplasmas and for the first time applied to the MMSspacecraft observations of acoustic solitons. The aboveresults have been published in the November issue ofPhysics of Plasmas and the December issue of TheAstrophysical Journal.