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Polar-glow aurora in polar cap absorption events

1962; Elsevier BV; Volume: 24; Issue: 3 Linguagem: Inglês

10.1016/0021-9169(62)90240-4

1878-593X

B. P. Sandford,

Astro and Planetary Science

During polar cap absorption events an extensive auroral type glow called the polar-glow aurora is observed. The geographical extent and time variations behave in the same manner as the polar cap absorption. The glow is primarily excited at heights below 100 km by protons in the energy range 0.5–100 MeV. It is estimated that the energy of the incoming protons exceeds 2 × 1013 eV/cm2 col sec. There appear to be relatively few protons with energies below 1 MeV and the maximum particle flux of about 107 protons/cm2 col sec is in the energy range of 1–10 MeV.