HAO Colloquium - Michel Blanc

A few scientific perspectives of The International Meridian Circle Program 

Michel Blanc, State Key Laboratory of Space Weather, NSSC, Chinese Academy of Sciences, Beijing, China, & Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France 

Our Magnetosphere-Ionosphere-Thermosphere system is a critical component of geospace whose overall structure, dynamics and energetics is influenced by an outstanding diversity of coupling processes, both horizontal and vertical. While these coupling processes can be observed in greatest detail at Earth, where their study also opens to the possibility of an operational monitoring of Space Weather, we can learn a lot about their diversity by studying them as well at other magnetized planets, particularly Jupiter and Saturn, taking advantage of their exploration by planetary probes. 

Studying the Earth case teaches us that our MIT system is disturbed by coupling “from above” (solar activity and the solar wind) and “from below” (nuclear, lithospheric and dense-atmosphere dynamical processes). We also know that each of these categories of coupling phenomena in turn induces complex latitudinal and longitudinal redistributions of the corresponding depositions of energy and momentum they produce. For these reasons, untangling these two broad categories of disturbance sources to be able to identify the respective roles of each of them is a major scientific challenge which deserves and requires a major international coordinated effort.

The International Meridian Circle Program (IMCP), a program proposed by the Chinese geospace science community and its international partners, is an ambitious contribution to this perspective which we will succinctly describe in this seminar. We will start from the identification of the top science and application drivers of this program to derive the associated key measurement objectives. We will then present the existing and planned components of the IMCP Observation System, both ground-based and space-based, which has been designed to provide these key measurements for their optimal use by the communities of scientific and other users. 

In the discussion, we will address the specific requirements on the international contributions and cooperation modes induced by this project, and its needs in terms of data sharing, data analysis and modelling efforts. 



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Friday, March 23, 2018 - 2:00am to 3:00am

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