Spacelab 2 measurement of the solar coronal helium abundance

Details Spacelab 2 measurement of the solar coronal helium abundance Spacelab 2 measurement of the solar coronal helium abundance

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...63g&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 7, p. (7)63-(7)67

Astronomy and Astrophysics

Astronomy

29

Abundance, Chromosphere, Helium, Hydrogen, Lyman Alpha Radiation, Solar Corona, Ultraviolet Astronomy, Challenger (Orbiter), Error Analysis, Excitation, Spacelab, Stellar Models, Ultraviolet Spectrometers, Ultraviolet Telescopes

Scientific paper

The abundance of helium relative to hydrogen has been measured with the 'Coronal Helium Abundance Spacelab Experiment' (CHASE) from the space shuttle Challenger in 1985. Previous solar measurements have proved difficult due to the temperature-sensitivity of the electron excitation rates for the observed lines. In this approach, scattered Lyman Alpha radiation of helium and hydrogen formed in the corona were measured with a grazing-incidence spectrometer and compared with the intensity of the illuminating flux from the solar chromosphere. The abundance ratio by number of atoms was found to be 0.070 with an uncertainty of 0.011. Scattered light in the telescope is the main source of error.

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