Experimental Dielectronic Recombination Results and their Implications for the Solar Transition Region

Details Experimental Dielectronic Recombination Results and their Implications for the Solar Transition Region Experimental Dielectronic Recombination Results and their Implications for the Solar Transition Region

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0516s&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #05.16; Bulletin of the American Astronomical Society, Vol. 24, p.736

Astronomy and Astrophysics

Astronomy

Scientific paper

Electric and magnetic fields of the magnitudes found in the solar atmosphere can significantly enhance dielectronic recombination (DR) rate coefficients. An experiment to measure DR rates as a function of the external electric field strength will be described. An initial result for the C(3+) DR rate coefficient through the 2s-2p core transition indicates that the DR rate for a 12 V/cm field is a factor of 7.2+/-1.8 (1sigma ) larger than calculated zero field values. This is a field strength comparable to the plasma microfield strength found in the upper transition region where C(3+) is abundant. We will present calculations showing the implications of field enhanced DR rates on the carbon ionization balance and on observations of solar UV emission lines. In particular, we show that the field enhanced C(3+) DR rate could lead to as much as a factor of 4 reduction in previously reported C(3+) fractional abundances. This requires a corresponding increase in emission measures to match the C IV lambda 1550 Angstroms emission line intensities observed in the Sun and late-type stars. This work is supported by NASA under Grant NAGW-1687 to the Harvard College Observatory.

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