Sensitivity of the curve-to-growth technique utilized in rocket experiments to determine the line shape of solar He I resonance lines

Details Sensitivity of the curve-to-growth technique utilized in rocket experiments to determine the line shape of solar He I resonance lines Sensitivity of the curve-to-growth technique utilized in rocket experiments to determine the line shape of solar He I resonance lines

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.9957w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Sept. 1, 1986, p. 9957-9964.

Statistics

Computation

3

Helium, Resonance Lines, Rocket-Borne Instruments, Solar Spectra, Spaceborne Experiments, Line Shape, Partial Pressure, Sensitivity, Solar Flux, Spectral Energy Distribution, X Ray Spectra

Scientific paper

The sensitivity of the curve-of-growth (COG) technique utilized in rocket measurements to determine the line profiles of the solar He I resonance emissions is theoretically examined with attention to the possibility of determining the line core shape using this technique. The line at 584.334 A is chosen as an illustration. Various possible source functions of the solar line have been assumed in the computation of the integrated transmitted intensity. A recent observational data set obtained by the present researchers is used as the constraint of the computation. It is confirmed that the COG technique can indeed provide a good measurement of the solar line width. However, to obtain detailed knowledge of the solar profile at line center and in the core region, (1) it is necessary to be able to carry out relative solar flux measurements with a 1-percent or better precision, and (2) it must be possible to measure the He gas pressure in the absorption cell to lower than 0.1 mtorr. While these numbers apply specifically to the present geometry, the results are readily scaled to other COG measurements using other experimental parameters.

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