Seis-Net a Possible Very Broad Band Seismometer for the Future Mars-Net Russian Mission

Computer Science – Performance

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[5494] Planetary Sciences: Solid Surface Planets / Instruments And Techniques

Scientific paper

Introduction: Following the invitation from IKI for participating to the future Russian Mars-Net mission, our objective is to realize a preliminary study for the deployment of a seismometers network, on the surface of Mars. This experiment would be realized thanks to the "basic brick" of the planetary seismometer developed by IPGP: a Very Broad Band (VBB) axis/pendulum adapted to the Mars-Net mission but analog to the one already proposed for other missions (Humboldt-ExoMars, Selene 2, Discovery GEMS). In order to respect, as much as possible, the mass and power budgets of the Mars96/OPTIMISM seismometer, we plan to propose only one axis/pendulum modified in order to become vertical. This adaptation could be, for instance, simply realized by adding an additional mass and modifying the axis tilt. Compared to the seismic sensor proposed for GEMS, there would be a deployment on Mars without any uncoupling from the lander. So, we estimate that the performances of the Mars-Net seismometer (< 0.1 ng/Hz1/2) will be halfway between OPTIMISM (1 ng/Hz1/2) and GEMS (< 0.05 ng/Hz1/2) seismometers. Scientific objectives: Since the projects Mesur/InterMarsNet in 1990 years then NetLander in 2000 years, our knowledge of interior of Mars has progressed. A network mission about 2018-2020 has to take into account these evolutions. However a lot of questions are still open without any answer. Which is the seismic activity of the planet? Which is the average thickness of the crust? Which is the detailed mineralogy of the mantle? Is there thermical heterogeneities inside mantle associated to a remaining of contemporary mantlellic convection? Which is the fine structure of the core? Therefore one of the first objectives of a network mission is the seismic discovery of Mars. That means, in particularly, to obtain for the first time the quantification of the contemporary seismic activity of the planet and the determination of the absolute thickness of the crust. That will be possible with the first station. But, of course, with the deployment of other stations it will be possible to inverse more elaborated models of the internal structure of Mars. Instrument description: The heritage, at IPGP, of planetary seismometers was often presented. Our accommodation study will be, obviously, based on this heritage. The idea is to reuse our "basic brick", that means the recurrent pendulum of ExoMars mission by aiming the same performances in terms of resolution. On the other hand, we will aim the OPTIMISM-Mars96 specifications in terms of mass, volume and power budgets. Taking in account the preliminary lander mass budget, we will propose only one axis, by using an oblique VBB axis and by tilting it until its sensibility axis became vertical. We would bring back the gravity center of the whole on the sensibility axis by adding a 50g mass on OG axis (which will become horizontal).

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