Solar & Heliospheric Observatory, is a project of international
collaboration between ESA and
NASA to study the Sun from its deep core to the outer corona and the
December 2, 1995. The SOHO spacecraft
was built in Europe
by an industry team
led byprime contractor Matra Marconi Space (now EADS Astrium) under
overall management by ESA.
The twelve instruments on board SOHO were provided by European and
Nine of the
international instrument consortia are
led by European
Principal Investigators (PI's), three by PI's
the US. Large engineering teams and more than 200 co-investigators from
many institutions supported the
in the development of the
instruments and in the preparation of their operations and data
launch and is now responsible for mission operations. Large radio dishes
around the world
which form NASA's Deep Space
Network are used for data downlink and commanding.
Mission control is based at Goddard Space Flight Center in Maryland.
ultraviolet Imaging Telescope) images the solar atmosphere at several
shows solar material at
temperatures. In the images taken at 304 Angstrom the bright
is at 60,000 to 80,000 degrees Kelvin. In those taken
at 171 Angstrom,
million degrees. 195
images correspond to about 1.5 million
Kelvin, 284 Angstrom to 2 million degrees. The hotter
the higher you look in the solar atmosphere.