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Flip a Sun's pole for more dust

20 August 2003

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SOHO is a project of international cooperation between ESA and NASA. SOHO's EIT (Extreme ultraviolet Imaging Telescope) images the solar atmosphere at several wavelengths and, therefore, shows solar material at different temperatures. In the images taken at 304 Angstroms, the bright material is at 60 000 to 80 000K. In those taken at 171, at 1 million Kelvin. 195 Angstrom images correspond to about 1.5 million Kelvin. The hotter the temperature, the higher you look in the solar atmosphere.

Credits: SOHO Instrument Consortium

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Over more than 17 years of observations above and below the poles of the Sun, the ESA/NASA Ulysses mission has made fundamental contributions to our understanding of the Sun itself, its sphere of influence (the heliosphere), and our local interstellar neighbourhood. The mission provided the first-ever map of the heliosphere in the four dimensions of space and time.

Ulysses was launched by Space Shuttle Discovery in October 1990. It headed out to Jupiter, arriving in February 1992 for the gravity-assist manoeuvre that swung the craft into its unique solar orbit. It orbited the Sun three times and performed six polar passes. The mission concludes on 1 July 2008.

Credits: ESA (image by D. Hardy)

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