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Ultraviolet Observations and a Theory of STEVE
  • Charles Lougheed Bennett
Charles Lougheed Bennett
Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory

Corresponding Author:[email protected]

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Abstract

A search for ultraviolet (UV) emissions in satellite data during known STEVE (Strong Thermal Emission Velocity Enhancement) events found that simultaneous subauroral UV arcs (SUA) were not always present in the Southern Hemisphere despite coverage of the conjugate STEVE location. Over the years 2005 to 2020 a total of 108 SUA and STEVE cases were found. A theory is presented in which MeV solar protons guided by the interplanetary magnetic field (IMF) produce these arcs along with STEVE as they precipitate into the atmosphere. Numerous aspects of STEVE and SUA are explained by this theory.