Offset Bipolar Pulses in Magnetospheric Plasma Systems

Abstract

AbstractThe satellite borne electric field instruments have been observed the signatures of Electrostatic Solitary Waves (ESWs) throughout the Earth’s magnetospheric boundary layers and have been recorded as localized monopolar, bipolar or tripolar pulses in the electric field (E data). There are also reports of various kinds of electric field structures by the satellites which are different from conventional bipolar pulses. There was no generic theory for them so far. In this work, we are intended to introduce offset bipolar pulses, a possible kinds of non-conventional pulses which can be supported by different kinds of space plasma system. In this regard, we have analyzed a warm multi-ions and two electron temperature plasma model which is quite signifying in magnetospheric studies by adopting the Sagdeev pseudopotential technique. Through rigorous numerical analysis, we have identified and delineated the conditions for the existence of flat top solitary wave, and correlate them with the non-conventional electrostatic solitary wave structures in space plasma observations. It is expected that it will provide a new way of understanding the non-conventional localized pulses in the E-field data recorded during satellite expeditions which are known to be important in determining the microphysics of the Earth’s magnetospheric plasma system.KeywordsFlat top solitary wavesElectrostatic solitary wavesOffset bipolar pulses