EUV Solar Observations with Voyager 2 Spectrometer

Details EUV Solar Observations with Voyager 2 Spectrometer EUV Solar Observations with Voyager 2 Spectrometer

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.4414d&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #44.14; Bulletin of the American Astronomical Society, Vol. 26, p.1379

Astronomy and Astrophysics

Astronomy

Scientific paper

Two solar observations obtained with the Ultraviolet Spectrometer on board Voyager 2 are presented in absolute flux units . The spectra, that are part of a larger collection of solar observations, cover the wavelength range of 50-125 nm with an effective resolution of about 3 nm. They were recorded in December 1985 (low solar activity) and in September 1989 (high solar activity), when the spacecraft was at a distance from the Earth of 18.9 and 30.0 AU, respectively. The data are used to estimate the ultraviolet irradiance variability, from minimum to maximum, during solar cycle 22 with particular interest in the region of shorter wavelengths, where very few measurements have been performed in the past years. The recent calibration of the Voyager solar observations indicates an higher flux level for the spectral region under 91.2 nm as well as for the H Lyalpha line than the ones expected from previous measurements.

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