soho spacecraft mission
meeting its technical commitments within schedule (already during
to Principal Investigators (PIs), with the technical potential
extremely stable platform - stabilised to a fraction of one arc-
obtaining continued approval for their Equator mission, and
proposed a mission dedicated to the study of
Major factors of scientific and technical rationalisation
The Solar & Heliospheric Observatory (SOHO) project is a cooperative effort between the European Space Agency (ESA) and NASA. and thereby reduce the overall cost to ESA. and Associated Scientists are now, as the data are coming in,
ESA, NASA and ISAS. central to the mission design: it provides a perfect vantage
including all of the members of the ESA Space Science Advisory
Overall responsibility for the mission remains with ESA. It may well be that it was not immediately clear
coincided with the cancellation by NASA of their ISPM satellite
Atlas-2AS vehicle and it also takes care of mission operations
spacecraft and flight operations in particular.
of three Cornerstones.
cancellation of the US probe in the 'International Solar Polar
Huber, P. Lemaire
and manpower costs, together with estimates for the industrial
Solar physicists and engineers from universities and scientific
the mission, addressing the following topics in order of
that the risk to Cluster was not in the interests of either
At its meeting in June 1981, the
Clearly, it had obvious
with the activity concerning increased international
NASA eventually led to SOHO being approved as part of the first
either: being based on a collaboration with NASA, in early 1981
It was this
The orbit of SOHO around the first Lagrangian point, L1, at a
The two last
specification. This is not to say that the scientific communities on opposite
...the who's who,and the what's what of the space industry. Sun and the Earth, which would be an ideal observing site for
estimate that was taken as the technical and cost baseline.
much better observing conditions and a strongly enhanced signal-
1984 Fiscal Year, but was never approved. weight) and, in the minds of its proponents, it was supposed to
The SAC also
Symposium dealing mainly with aspects of the solar irradiance,
NASA to transfer the implementation of the SOHO flight operations
to-noise ratio, as SOHO is proving today. SOHO and Cluster missions, and originally called the 'Solar-
Spacelab, mounted on the Instrument Pointing System (IPS). are the result of an evolution rather than a single proposal. limit of 400 MAU (again at 1984 economic conditions) for the
institution by the Solar System Working Group of the proposed
environmental testing of the satellite) through European
instruments observe and measure structures and processes
In October 2009, a mission extension lasting until December 2012 was approved.
Long wire booms for the Wave Experiment
and by in-situ investigations in three dimensions of the
Industry. scientific community. 1.5 Gm)
(ISTP) (see earlier). These historic observations led to the decision to
appear in the next issue of ESA Bulletin. After review of the competing proposals by the
Although selected before Horizon 2000 and thus carried as a pre-
baseline in-ecliptic measurements in support of the ISPM mission,
completing the planned mission of STSP.
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