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MLT dependence in the relationship between plasmapause, solar wind and geomagnetic activity based on CRRES: 1990-1991

We present linear and more complex plasmapause (Lpp) models obtained by using the database of CRRES in situ observations of the plasmapause crossings. The models are parametrized by (a) solar wind coupling functions V (solar wind velocity), BV (related to the solar wind electric field, where B is the magnitude of the interplanetary magnetic field IMF), and dPhi/dt (which combines different physical processes responsible for the magnetospheric activity), and (b) geomagnetic activity indices Dst, Ap and AE. The complex models are built by including a first harmonic in MLT. The approach is based on cross correlation analyses and provides not only the Lpp shape, but additionally the information of the delays in the MLT response of the plasmapause. We compare the Lpp shapes based on CLUSTER, IMAGE, THEMIS and CRRES datasets, and discuss the propagation of the convective instabilities through MLT sectors during maximum and around minimum of solar activity. This study contributes to constrain the MLT dependence of the plasmapause.

plasmapause ; solar wind ; geomagnetic indices ; satellites

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