Solar flares and D-region ionization sources at high zenith angles
Tipo
Artigo
Data de publicação
1974
Periódico
Journal of Atmospheric and Terrestrial Physics
Citações (Scopus)
2
Autores
Gough M.P.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
VLF phase measurements were made at three locations along the same great circle path of propagation during a solar flare which occurred on 29 June 1973. The termination for the solar flare effect on the ionosphere at VLF reflecting heights occurred between solar zenith angles 84° and 87°, considerably less than the sunset zenith angle of 94° for this height. Ionization production is considered for the various ionization sources as a function of zenith angle. The measurement is consistent with the electron density at VLF reflecting heights being primarily controlled by solar photo-detachment but at zenith angles greater than 76° the ionization available for photo-detachment is produced by scattered Lyman-α as the direct Lyman-α becomes too heavily absorbed. © 1974.