The effect of a non-Maxwellian electron distribution on oxygen and iron ionization balances in the solar corona

Details The effect of a non-Maxwellian electron distribution on oxygen and iron ionization balances in the solar corona The effect of a non-Maxwellian electron distribution on oxygen and iron ionization balances in the solar corona

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..758o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 758-768. Research supported by the Smithsonian Insti

Astronomy and Astrophysics

Astrophysics

73

Electron Distribution, Ionization, Solar Corona, Electron Energy, Iron, Oxygen Ions, Radiative Recombination, Velocity Distribution

Scientific paper

Analytic expressions are derived for ionization and recombination rates in a parameterized non-Maxwellian electron velocity distribution with an enhanced high-energy tail. These expressions are then used in investigating the effect of such an enhancement in the high-energy tail of the coronal electron velocity distribution on the oxygen and iron ionization balances, O(+6) - O(+7) and Fe(+11) - Fe(+12). Relative to a Maxwellian of the same mean electron energy, the degree of ionization allowed by such a distribution is found to be either unchanged or slightly decreased for iron but often substantially increased for oxygen. The greater sensitivity of oxygen ionization balance to the high-energy distribution tail derives from the higher oxygen ionization threshold energy. It is noted that the electron temperature inferred from a measurement of the oxygen ionization ratio, O(+6)/O(+7), could indeed overestimate the actual coronal electron temperature by nearly 10 to the 6th K if the coronal electron distribution is incorrectly assumed to be Maxwellian.

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