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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Radio tracking of the interplanetary coronal mass ejection driven shock crossed by Ulysses on 10 May 2001
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Radio tracking of the interplanetary coronal mass ejection driven shock crossed by Ulysses on 10 May 2001

机译：无线电追踪的星际日冕物质喷射冲击了由《尤利西斯》10日2001年5月

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摘要

We report on the detection of type II radio emission which was observed for more than a day prior to the arrival of an interplanetary shock at Ulysses. We use local spectral emission peaks, computerized from time-averaged intensity spectra of the type II burst, to track the associated emitting shock. In the spectrogram plotted as a function of time and inverse frequency, these peaks appear as elongated clusters of data points, organized in fundamental-harmonic bands and delineating drifting emission features. Least squares linear fittings to identified clusters give straight traces with different slopes. Most of these, when extrapolated to the Sun, are found to converge nearly at the same starting time, allowing determination of the average shock speed. Shortly before the shock crossing, intense Langmuir waves were detected at the electron plasma frequency upstream of the shock. This plasma wave enhancement together with the radio emission observed predominantly at the harmonic of the plasma frequency, all point to the occurrence of the type II radio source region in the upstream electron foreshock. We have accurately substracted the thermal noise background from the observed emission intensity to deduce the type II brightness temperatures at the fundamental and harmonic near the shock crossing. The measured brightness temperature of the type II harmonic emission is found to peak at a value of 3 × 1013 K just after the shock crossing; just before, the harmonic brightness temperature is 1012 K and the fundamental brightness temperature 8 × 1011 K.
机译：我们在II型电台的检测报告发射观测到超过一天到来前的行星际激波在《尤利西斯》。电脑从时间上光谱强度II型的破灭,跟踪相关的发出冲击。时间的函数和逆频率,这些峰值出现的细长的集群数据点,在基波乐队组织和描述漂流排放特性。广场线性配件确定集群与不同的斜坡给笔直的痕迹。其中,外推到太阳时,被发现收敛几乎在同一时间开始,允许测定平均冲击速度。朗缪尔波检测的电子等离子体频率上游的冲击。等离子体波增强的收音机发射所观察到的主要谐波等离子体频率,所有指向出现的II型无线电来源地区上游电子前震。准确地减热噪声从观察到的排放强度背景推导出II型亮度温度基本和谐波附近的冲击穿越。发现II型谐波发射峰值为3×1013 K的冲击穿越;温度1012 K和根本亮度温度8×1011 K。

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