A model of Saturn's magnetic field based on all available data

A model of Saturn's magnetic field based on all available data
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基于所有可用数据的土星磁场模型

DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
E. Smith
E. Smith
中科院分区：
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文献类型：
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作者：
L. Davis;E. Smith

文献摘要

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SPV（Saturn Pioneer Voyager）土星磁场模型使用了先驱者11号、旅行者1号和旅行者2号在土星遭遇期间传输的最精确的磁力计数据。它拟合了在距离土星中心1.3到8.0土星半径之间观测到的数据，观测场和模拟场之间的百分比差异的加权均方根平均值为1.13%。SPV模型的内源项系数为g10 = 21，160。nT，g20 = 1560。nT，且g30 = 2320。nT，土星半径为60，330公里。他们是相同的所有三个遭遇，应该是有效的十年，也许更长。距离单位（土星的半径）影响高斯系数的值。我们调整了所有模型的系数，使其与60，330公里相对应，以便进行比较。基于我们的权重和使用百分比残差，而不是绝对残差，SPV模型比以前发表的P1184模型或Z3模型更好地拟合观测场。由于在外部区域的电流的字段的一部分是不轴对称的，从一个遇到另一个和从入境到出站腿变化约5 nT。由于这些外部来源，场的部分的最佳可用但粗糙的模型是六个均匀场，每个遭遇两个。
The SPV (Saturn Pioneer Voyager) model of Saturn's magnetic field presented here uses the most accurate magnetometer data transmitted from Pioneer 11, Voyager 1, and Voyager 2 during their Saturn encounters. It fits the data observed between 1.3 and 8.0 Saturn radii from the planet's center with a 1.13% weighted root-mean-square average of the percent differences between the observed and modeled fields. The coefficients for the interior source terms for the SPV model are g10 = 21,160. nT, g20 = 1560. nT, and g30 = 2320. nT for a Saturn radius of 60,330 km. They are the same for all three encounters and should be valid for a decade and perhaps very much longer. The distance unit (the radius of Saturn) affects the values of the Gaussian coefficients. We have adjusted the coefficients of all the models to correspond to 60,330 km so that they can be compared. On the basis of our weights and the use of percent residuals, rather than absolute residuals, the SPV model fits the observed fields better than does the previously published P1184 model or the Z3 model. The part of the field due to currents in the outer regions is not axisymmetric and varies by approximately 5 nT from one encounter to another and from the inbound to outbound legs. The best available, but crude, models for the part of the field due to these external sources are six uniform fields, two for each encounter.