Geophysical investigations of earth, moon and mercury

这一提议包括对水星、月球和地球磁场的研究，以及对水星地壳和岩石圈的研究。这些主题提供了关于太阳系内行星和卫星的内部结构和演化的信息。 对水星的调查将使用美国国家航空航天局信使任务的数据，2008年和2009年的三次飞行数据，以及2011-2012年的轨道数据。拟议的研究将允许区分磁场的地壳来源和核心来源，并对拟议的核心发电机模型进行评估。结合使用地形、重力和图像数据，可以研究水星随时间变化的地壳和岩石圈的厚度，并调查大型撞击盆地的演化。 卫星对月球磁场的观测，以及在一些阿波罗样品中观察到的强磁化作用表明，月球地壳中存在剩余磁化；然而，磁化磁场的来源和时间尚不清楚。已经提出了核心发电机和冲击(冲击)过程。拟议中的研究旨在了解月球是否有核心发电机，如果有，什么时候。如果冲击波在月球上获得地壳剩磁方面发挥了重要作用，为什么这一记录与在火星上的记录如此不同，这对水星有什么影响？ 地球磁场的结构和演化是理解地球发电机和地球深层的关键，但它的许多方面仍然没有得到充分的记录。拟议的研究将通过整合不同类型的岩石磁记录和开发全球磁场模型来绘制过去2.5Myr期间磁场强度和方向的变化图。

This proposal comprises studies of the magnetic fields of Mercury, the Moon and Earth, along with studies of Mercury's crust and lithosphere. These topics provide information on the interior structure and evolution of inner solar system planets and moons. Investigations of Mercury will use data from NASA's MESSENGER mission, from 3 flybys in 2008 and 2009, and from orbit in 2011-2012. The studies proposed will allow discrimination of crustal and core sources for the magnetic field, and evaluation of proposed core dynamo models. The combined use of topography, gravity, and image data will allow studies of the thickness of Mercury's crust and lithosphere over time, and investigations of the evolution of large impact basins. Satellite observations of the lunar magnetic field, along with strong magnetizations observed in some Apollo samples indicate the presence of remanent magnetization in the lunar crust; however the origin and timing of the magnetizing field is not understood. Both a core dynamo and impact (shock) processes have been suggested. Proposed studies aim to understand whether the Moon had a core dynamo and if so when. If shock has played a major role in the acquisition of crustal remanence on the Moon, why is this record so different from at Mars, and what implications does this have for Mercury? The structure and evolution of Earth's magnetic field is key to understanding the geodynamo and Earth's deep interior, but many aspects of it remain poorly documented. Proposed studies will map the changes in strength and direction of the field over the past 2.5 Myr, by integrating different types of rock magnetic records, and developing global magnetic field models.