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Phoebus group
The Phoebus group is an international team of European, Japanese and American scientists aiming at detecting the solar g modes. As of October 5, 2009, the group has finally produced a review summarising the work performed over the past 12 years.〔The quest for solar g modes, 2009, Astronomy and Astrophysics Review, available at http://adsabs.harvard.edu/abs/2010A%26ARv..18..197A〕
==Scientific Rationale==
Since the beginnings of global helioseismology in the late 1970s, the detection of g modes has been the quest for the Grail. The detection of g modes would be key to the understanding of the internal structure and dynamics of the solar core, as much as the p modes are key to that of the structure of the radiative and convective zones. The impact of g-mode detection would be so large that we could expect a wealth of information to be returned. The structure and dynamics of the energy-generating core will be seen, analyzed and understood. The hydrostatic structure of the core, in particular its deepest lying layers, will be uncovered to a far higher level of accuracy and precision; while it will be possible to infer the rotational characteristics of the core, characteristics that at present we are unable to uncover, to a satisfactory level of precision, with the current p-mode data.
This quest was a major driver in the design of very precise and quiet instrumentation harboured by spacecraft such as the Solar and Heliospheric Observatory (SOHO. Aboard SOHO, there are three instruments dedicated to helioseismology all aiming at detecting g modes. A few years after the launch of SOHO in end 1995, it was realized that g modes would not be easily detected.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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