Early results from the CHASE experiment flown on Spacelab 2

Details Early results from the CHASE experiment flown on Spacelab 2 Early results from the CHASE experiment flown on Spacelab 2

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jbis...39..207g&link_type=abstract

British Interplanetary Society, Journal (Space Science) (ISSN 0007-084X), vol. 39, May 1986, p. 207-210.

Physics

1

Abundance, Helium, Solar Corona, Spacelab Payloads, Gratings (Spectra), Grazing Incidence Telescopes

Scientific paper

The Coronal Helium Abundance Spacelab Experiment (CHASE), flown on the Space Shuttle as part of the Spacelab 2 payload on July 29, 1985, was designed to measure the abundance of helium relative to hydrogen; a measure of this quantity is an important verification of models of the birth of the universe. In addition to this primary objective, the instrument was used to study the properties of the corona. CHASE instrumentation and operation are described, and preliminary data are examined. The instrument consists of a grazing incidence spectrometer covering the wavelength range of 150 A to 1350 A, illuminated by a grazing incidence telescope of 28 cm focal length; the spectrometer module incorporated the mechanism control electronics, detector preamplifiers, high voltage supplies and a sensor to indicate the offset from the sun center. Spectral lines are indicated schematically, and it is noted that there is no problem separating the He II line from the nearby Si XI line. Mapping of large areas of the sun revealed that at low temperature, two bright points are apparent, whereas at high temperature, these coalesce to form a single bright patch in the center.

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