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The influence of the magnetic field shear is studied on the  E  ×  B  (and/or gravitational) and the Current Convective Instabilities (CCI) occurring in the high‐latitude  F  layer ionosphere. It is shown that magnetic shear reduces the growth rate of these instabilities. The magnetic shear‐induced stabilization is more effective at the larger‐scale sizes (≥ tens of kilometers) while at the scintillation causing intermediate scale sizes (∼ a few kilometers), the growth rate remains largely unaffected. The eigenmode structure gets localized about a rational surface due to finite magnetic shear and has broken reflectional symmetry due to centroid shift of the mode by equilibrium parallel flow or current.

Magnetic Shear Damped Polar Convective Fluid Instabilities