Energy and power requirements of the global thermosphere during the magnetic storm of November 10, 2004

We used Poynting fluxes and densities ρ¯ to investigate the stormtime thermosphere on November 10, 2004. Thermospheric energy, Eth which is derived from ρ¯, consists of two sources, solar ultraviolet radiation (Eth UV) and the solar wind (Eth SW). Responses of Eth SW to interplanetary driving suggest that the thermosphere can be described by the equation dEth SW/dt=αεVS−(Eth SW/τ), where εVS represents the electric field; α and τ are constants. We show that: (1) Eth SW is three times the ring-current energy; (2) αεVS is comparable with model predictions; (3) signatures of equatorward propagating disturbances were detected in neutral density profiles.