Slar SI III line ratios from the high-resolution telescope and spectrograph on board Spacelab 2 - The effects of non-Maxellian electron distribution functions

Details Slar SI III line ratios from the high-resolution telescope and spectrograph on board Spacelab 2 - The effects of non-Maxellian electron distribution functions Slar SI III line ratios from the high-resolution telescope and spectrograph on board Spacelab 2 - The effects of non-Maxellian electron distribution functions

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340.1135k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 1135-1139. Research supported by SERC and U.S. Navy.

Astronomy and Astrophysics

Astrophysics

13

Electron Energy, Silicon, Solar Spectra, Sunspots, Atomic Energy Levels, Distribution Functions, Electron Transitions, High Resolution, Spacelab, Temperature Gradients

Scientific paper

Electron impact excitation rates for transitions in Si III, incorporating the effects of non-Maxwellian electron velocity distribution functions (EVDFs), are presented for a range of electron temperatures appropriate to the solar transition region. A comparison of theoretical line ratios with observational data for a quiet solar region, a sunspot, and an active region obtained with the high-resolution telescope and spectrograph (HRTS) on board Spacelab 2 indicates that non-Maxwellian EVDFs may exist in the transition region. Non-Maxwellian effects appear to be larger for the sunspot than for the quiet sun, implying that the temperature gradient may be greater in the former.

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