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Electron density diagnostics for solar ultraviolet lines E. O'Shea (e.oshea@queensbelfast.ac.uk), T. O'Neill

Summary: Electron density diagnostics for solar ultraviolet lines
of O v
E. O'Shea (e.oshea@queens­belfast.ac.uk), T. O'Neill
(terry.oneill@jet.uk) and F.P. Keenan
Dept. of Pure and Applied Physics, The Queens University of Belfast, Belfast BT7
1NN, N. Ireland.
J.G. Doyle (jgd@star.arm.ac.uk)
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland.
We determine the electron densities for a range of solar features using new
calculations for the O v line ratio, R = I(–761:1)=I(–760:4), in conjunction with
observational data obtained with the Solar Ultraviolet Measurements of Emitted
Radiation (sumer) instrument on the Solar and Heliospheric Observatory (soho).
The densities obtained from this diagnostic are in good agreement with earlier
measured values. This provides support for the theoretical diagnostics presented
in this paper, and hence the atomic data used in their derivation. We conclude from
these results that this particular O v ratio is a useful diagnostic for many types of
solar features.
Keywords: Sun: Density diagnostics: Ultraviolet: soho­sumer


Source: Armagh Observatory


Collections: Physics