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Temperature anisotropies may be encountered in space plasmas when there is apreferred direction, for instance, a strong magnetic or electric field. Inthis paper, we study how ion temperature anisotropy can affect the thresholdconditions of a shear-modified current driven electrostatic ion-acoustic(CDEIA) instability. In particular, this communication focuses oninstabilities in the context of topside auroral F-region situations and inthe limit where finite Larmor radius corrections are small. We derived a newfluid-like expression for the critical drift which depends explicitly on ionanisotropy. More importantly, for ion to electron temperature ratios typicalof F-region, solutions of the kinetic dispersion relation show that iontemperature anisotropy may significantly lower the drift threshold requiredfor instability. In some cases, a perpendicular to parallel ion temperatureratio of 2 and may reduce the relative drift required for the onset ofinstability by a factor of approximately 30, assuming the ion-acoustic speedof the medium remains constant. Therefore, the ion temperature anisotropyshould be considered in future studies of ion-acoustic waves andinstabilities in the high-latitude ionospheric F-region

annales geophysicae

Ion temperature anisotropy effects on threshold conditions of a shear-modified current driven electrostatic ion-acoustic instability in the topside auroral ionosphere