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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Improved calculations of interplanetary magnetic field phase front angles and propagation time delays
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Improved calculations of interplanetary magnetic field phase front angles and propagation time delays

机译：提高了行星际磁场的计算场相位角度和传播时间前面延迟

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摘要

It has been known that the variations in the interplanetary magnetic field (IMF) occur within surfaces that are tilted with respect to the solar wind velocity vector. This tilting of the IMF phase fronts may cause the propagation from a point of observation to another location to have delay times that vary substantially. Therefore for accurate delay calculations in real time, or for the creation of scientific data sets, it is necessary to be able to determine the phase surface orientation angles using the magnetic field measurements on one spacecraft only. Methods for calculating these tilt angles have been tested for accuracy by a comparison using IMF measurements on multiple satellites. One method is a variation of the minimum variance of the magnetic field, where it is constrained by the condition that the average field along the phase front's normal vector is zero. This method is referred to as MVAB-0. Another technique is to simply calculate the vector cross product between magnetic fields measured at two different sample times. The choices of the different parameters for the calculation and error discrimination are important. An optimization of parameters was done by testing how well the propagation delays from one spacecraft to others are predicted. The tests have indicated that, when optimized, both procedures work comparably well. It had also been found that further improvements to time delay predictions are obtained by combining together both the MVAB-0 and cross-product techniques, where the results of both methods must be in near agreement.
机译：已经知道的变化行星际磁场(IMF)内发生倾斜的表面太阳风速度矢量。国际货币基金组织(IMF)阶段方面可能引起的传播点的观察到另一个位置延迟时间大幅变化。实时准确的延迟计算,或创建科学的数据集,它是必须能够确定阶段使用磁表面取向的角度实地测量在一只飞船。计算这些倾斜角度的方法被比较使用检测精度国际货币基金组织在多个卫星的测量。方法是最小方差的变化磁场,限制的平均场的条件前阶段的法向量是零。被称为MVAB-0。简单地计算之间的向量积磁场测量两种不同的样品次了。计算和误差歧视重要的。通过测试的传播延迟一个宇宙飞船预计。表明,优化的时候,都有程序工作相对好。发现,进一步改进时间延迟预测是通过结合在一起MVAB-0和跨产品技术,这两种方法的结果必须在附近吗协议。

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