Calculated auroral emission for the scenario in which the electron precipitation is assumed to occur between 29° and 32° ILATs. Top: column emission rates at 630.0 nm (solid) and 557.7 nm (dotted) from the point of an observer at 27.4° MLAT (black circle); middle: volume emission rate at 630.0 nm in the meridional plane; and bottom: volume emission rate at 557.7 nm. The electron precipitation is assumed to occur between 29° and 32° ILATs. The solid curve indicates the surface of the Earth. Magnetic north is to the left. The red aurora dominates the green one. The simulation result may be consistent with the description “half the sky in the north was as red as crimson” (J20).