The use of stratospheric balloons in astronomy - Sun-pointing nacelles for the study of the solar UV spectrum

Details The use of stratospheric balloons in astronomy - Sun-pointing nacelles for the study of the solar UV spectrum The use of stratospheric balloons in astronomy - Sun-pointing nacelles for the study of the solar UV spectrum

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lastr..97..211l&link_type=abstract

L'Astronomie (ISSN 0004-6302), vol. 97, May 1983, p. 211-217. In French.

Computer Science

Performance

Balloon-Borne Instruments, High Altitude Balloons, Nacelles, Pointing Control Systems, Solar Spectrometers, Ultraviolet Spectra, Atmospheric Windows, Near Ultraviolet Radiation, Solar Instruments, Solar Spectra

Scientific paper

The design and performance characteristics of sun-pointing nacelles for high altitude balloon observation of solar emissions is described. Solar UV astronomy at altitudes above 30 km allows detection of spectral lines below 3000 A otherwise absorbed by the atmosphere, particularly by ozone. The resonance doublet of Mg is observable, providing information on the mean chromospheric behavior. Emissions below 2080 A are accessible, and originate in the thin atmospheric layer around the sun. An equatorial nacelle allows the sun-pointing fixation of the instruments. Meridional acquisition is achieved by means of a magnetometer and a reaction wheel, which decouples the nacelle from motions of the tether connecting the nacelle to the balloon. Narrow-field sun sensors with successively higher resolution within a series produce stabilization on the solar disk. The first flight of the nacelle was in 1982, when a pointing accuracy of 4 deg was demonstrated while using a spectrograph.

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