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On the possibility to determine the electrical conductivity of 67P/CG from ROSETTA magnetic field observations

机译：从ROSETTA磁场观测确定67P / CG电导率的可能性

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摘要

The ROSETTA mission to comet 67P/Churyumov-Gerasimenko presents us for the first time the opportunity to study the interior of a cometary nucleus. Information about the electrical conductivity and its distribution inside the nucleus can be derived by measuring the magnetic fields induced in the nucleus by variations of the interplanetary magnetic field. Due to the relatively small size of the nucleus, this task is not trivial and requires very precise magnetic field measurements. Here we analyze the response of a conductive nucleus to transient step-like magnetic field changes as well as the response in frequency domain to electromagnetic waves. For the nucleus we use a spherical model with either uniform conductivity or consisting of a core and an outer layer with different conductivities. The space outside of the nucleus is modeled either by highly conductive solar wind plasma or by zero conductivity void. Various combinations of conductivities, radii of the nucleus and of the core, and properties of the space outside the nucleus result in different inductive responses. Several such combinations which could be encountered by ROSETTA are studied in detail in order to estimate which conductivity ranges and core radii can be determined using the ROSETTA instruments and which mission operations would facilitate such measurements.
机译：ROSETTA对67P / Churyumov-Gerasimenko彗星的飞行任务首次为我们提供了研究彗核内部的机会。关于电导率及其在核内的分布的信息可以通过测量行星际磁场的变化来测量在核中感应的磁场而得出。由于原子核的尺寸相对较小，因此这项任务并非微不足道，需要非常精确的磁场测量。在这里，我们分析了导电核对瞬态阶梯状磁场变化的响应以及频域对电磁波的响应。对于原子核，我们使用具有均匀电导率或由芯和具有不同电导率的外层组成的球形模型。原子核外部的空间可以通过高导电率的太阳风等离子体或零电导率空隙建模。电导率，原子核和核的半径以及原子核外部空间的性质的各种组合会导致不同的感应响应。详细研究了ROSETTA可能遇到的几种这样的组合，以便估计使用ROSETTA仪器可以确定哪些电导率范围和核心半径，以及哪些任务操作将有助于进行此类测量。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.1-9|共9页
  • 作者

    O.D. Constantinescu; K.-H. Glassmeier; U. Auster; Richter; K.-H. Fornacon; C. Carr;

  • 作者单位

    TU Braunschweig, Institutfiir Ceophysik und extraterrestrische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany,Institute for Space Sciences, Str. Atomistilor 111, P.O.Box MG23, RO76900 Magurele, Romania;

    TU Braunschweig, Institutfiir Ceophysik und extraterrestrische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany;

    TU Braunschweig, Institutfiir Ceophysik und extraterrestrische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany;

    TU Braunschweig, Institutfiir Ceophysik und extraterrestrische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany;

    TU Braunschweig, Institutfiir Ceophysik und extraterrestrische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany;

    Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ROSETTA; 67P/CG; electomagnetic induction; electric conductivity; cometary nucleus;

    机译：罗塞塔;67P / CG;电磁感应;电导率彗核;

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