Theories of the Aurora

摘要: Publisher Summary This chapter discusses the theories of aurora. A list salient features aurora, meant to serve as a guide attempts at theoretical interpretations, is given dealing with observed data. The main aurorae are: auroral zones, hydrogen lines, heights, time variations, relationship solar events, and typical display. reviews that consider various mechanisms primary or dominant feature aurorae. problem excitation also discussed in chapter. In starting point for developments spectrum. It appears careful analyses spectroscopic photometric evidence may provide invaluable guidance toward proper theory. Stormer's theory are detail. application dipole orbits provided. ion streams which net current flows between Sun Earth. these return neglected. Currents appear other but different connections example, currents induced on surface Chapman–Ferraro stream, although there no Chapman Ferraro divided into two parts stream ring current. excitation.