... Discrete auroras are the most intense auroral types where field-aligned acceleration play an important role, forming the so-called inverted-V precipitation. Discrete auroral types include . Quiet auroral arcs . ... Auroral bulge . ... They are located on the poleward part of the auroral oval, in the region of the so-called boundary plasma sheet (BPS) precipitation mapping to plasma sheet and its boundary layer (PSBL). ... Other discrete auroras include . ... Mantle aurora (open field lines!) ...