Liquid Sodium Geodynamo Models

液钠地球发电机模型

• 批准号: 0207789
• 负责人: Daniel Lathrop
• 金额: $ 36.15万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207789&HistoricalAwards=false
• 关键词: Liquid; Sodium; Geodynamo; Models

LathropEAR-0207789This project seeks to better understand the generation mechanism for the Earth's magnetic field. This geophysics grant funds research in a new device designed to self-generate magnetic fields at parameters close to the Earth. This new device drives liquid sodium to flow in a three-meter spherical tank. The tank and the enclosed propellers rotate independently to drive a sodium flow to stretch and amplify magnetic fields. The goal is to better understand the saturation mechanism, which determines the strength of the Earth's field, as well as characterize the dynamics of a saturated self-generating dynamo state (such as reversals). New diagnostics are planned to better characterize the fluctuations in the magnetic field and the fluid velocity, including ultrasound velocimetry, spherical magnetic field sensors, and a magnetic field imaging array. The effects of rotation and Lorentz forces on the velocity and magnetic fields are specific issues these diagnostics will probe. This scientific exploration seeks to shed light on the dynamics of field self-generation on a wide variety of objects showing active fields (the Earth, the Sun, Jupiter, Saturn, Io) as well as those lacking self-generation such as Venus.--

该项目旨在更好地了解地球磁场的产生机制。 这项物理学研究资助了一种新设备的研究，该设备旨在以接近地球的参数自生磁场。 这个新装置驱动液态钠在一个三米长的球形容器中流动。 水箱和封闭的螺旋桨独立旋转，驱动钠流拉伸和放大磁场。 目标是更好地理解饱和机制，它决定了地球磁场的强度，以及表征饱和自生发电机状态（如反转）的动态。 新的诊断计划，以更好地表征磁场和流体速度的波动，包括超声测速，球形磁场传感器和磁场成像阵列。 旋转和洛伦兹力对速度和磁场的影响是这些诊断将探讨的具体问题。 这项科学探索旨在阐明各种各样的物体上的场自生动力学，这些物体显示活跃的场（地球，太阳，木星，土星，木卫一）以及那些缺乏自生的物体，如金星。