Kinetic Alfven wave (KAW) eigenmode in magnetosphere magnetic reconnection

Abstract One prominent signature of collisionless magnetic reconnection in the magnetosphere is Hall effect. In ion-scale region reconnection, ions cannot follow field line whereas electrons are still magnetized. The difference motions and leads to charge separation, resulting transverse electric field, field-aligned streaming preserve neutrality, corresponding field. Such physics has long been invoked discovery kinetic Alfven waves (KAW) when perpendicular wavelength becomes comparable ion scale. this review, we present recent progresses theoretical modeling, numerical simulations situ observations that analyze effects terms KAW eigenmode. This review will also cover analysis impact eigenmode on acceleration energy conversion reconnection. We emphasize perspective can provide a unified description various phenomena including fields, current, parallel B , non-gyrotropy velocity distribution ions, close connection between fields fast rate ( $$\sim$$ ∼ 0.1). quantitative these aspects necessary for Petschek-type model era