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Forward Modeling of the Phobos Tides and applications to the first Martian year of the InSight mission
Earth and Space Science ( IF 2.312 ) Pub Date : 2021-06-10 , DOI: 10.1029/2021ea001669
L. Pou, F. Nimmo, P. Lognonné, D. Mimoun, R. F. Garcia, B. Pinot, A. Rivoldini, D. Banfield, W. B. Banerdt

The tidal response of Mars, due to the Sun and the Martian moons, Phobos and Deimos, provides information about the interior structure of Mars. By using the VBB seismometer of SEIS as a gravimeter on the surface of Mars, the InSight mission will provide long-period data suited to tidal analysis: most notably, the proximity of Phobos implies that degree 2, 3, 4 and further tides will be detectable by the VBB and are expected to provide information about the rheology at different depths within Mars. In order to expedite the recovery of these tidal signals in the SEIS measurements, we model the tides raised by Phobos using a tidal potential deduced from JPL Horizons ephemerides. From this potential, we calculate the expected tidal acceleration at InSight's location and gravimetric factors using a set of plausible interior models of Mars. To simulate the expected long period signal on the VBB seismometer, we use the InSight APSS data to model the noise seen at low frequency by SEIS mainly due to temperature and pressure variations. Based on this synthetic signal, by applying filtering methods such as stacking and matched filtering to these synthetic data, we show that by recovering the gravimetric factors, it should be possible to constrain the state of the core and its size with an accuracy of 125 km after 2 Earth years.

中文翻译:

火卫一潮汐的正向建模和应用到洞察号任务的第一个火星年

由于太阳和火星卫星、火卫一和火卫二,火星的潮汐反应提供了有关火星内部结构的信息。通过使用 SEIS 的 VBB 地震仪作为火星表面的重力仪,洞察号任务将提供适合潮汐分析的长周期数据:最值得注意的是,火卫一的接近意味着 2、3、4 度和更远的潮汐将是可被 VBB 探测到,并有望提供有关火星内不同深度流变学的信息。为了在 SEIS 测量中加快这些潮汐信号的恢复,我们使用从 JPL Horizo​​ns 星历推导出的潮汐势对火卫一引发的潮汐进行建模。根据这个潜力,我们使用一组合理的火星内部模型计算洞察号位置和重力因素的预期潮汐加速度。为了在 VBB 地震仪上模拟预期的长周期信号,我们使用 InSight APSS 数据来模拟 SEIS 在低频下观察到的主要由于温度和压力变化引起的噪声。基于这个合成信号,通过对这些合成数据应用叠加和匹配滤波等滤波方法,我们表明通过恢复重力因子,应该可以以 125 公里的精度约束核心的状态及其大小2个地球年之后。
更新日期:2021-06-10
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