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首页> 外文期刊>Planetary and space science >Occurrence and source characteristics of the high-latitude components of Jovian broadband kilometric radiation
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Occurrence and source characteristics of the high-latitude components of Jovian broadband kilometric radiation

机译：Jovian宽带公里辐射的高纬度分量的发生和源特征

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摘要

Ulysses had a "distant encounter" with Jupiter when it was within 0.8 AU of the planet during February, 2004. The passage of the spacecraft was from north to south, and observations of the Jovian radio waves were carried out for a few months from high to low latitudes (+80° to + 10°) of Jupiter. The statistical study performed during this "distant encounter" event provided the occurrence characteristics of the Jovian broadband kilometric radiation (bKOM), including the high-latitude component as follows: (1) the emission intensity of bKOM was found to have a sinusoidal dependence with respect to the central meridian longitude (CML), showing a broad peak at ～180°, (2) bKOM was preferably observed in the magnetic latitudinal range from - + 30° to +90°, and the emission intensities at the high latitudes were found to be two times larger than that at the equatorial region, and (3) the emission intensity was controlled possibly by the sub solar longitude (SSL) of Jupiter. The intensity had a sharp peak around SSL ~210°. A 3D ray tracing approach was applied to the bKOM in order to examine the source distribution. It was suggested that: (1) the R-X mode waves generated through the Cyclotron Maser Instability process would be unable to reproduce the intense high-latitude component of the bKOM, (2) the L-O mode, which was assumed to be generated at frequencies near the local plasma frequency, was considered to be the dominant mode for past and present observations at mid- and high-latitudinal regions, and (3) the high-latitude component of bKOM was found to have a source altitude of 0.9-1.5 Rj (Rj: Jovian radii), and to be distributed along magnetic field lines having L>10.
机译：2004年2月，尤利西斯在距木星0.8 AU以内时与木星发生了“遥远的相遇”。飞船的飞行是从北向南，从高空观察了几个月的木星无线电波到木星的低纬度（+ 80°至+ 10°）。在此“遥远相遇”事件期间进行的统计研究提供了木星宽频公里辐射（bKOM）的发生特征，包括高纬度分量如下：（1）发现bKOM的发射强度具有正弦相关性，与相对于中央子午线（CML），在〜180°处显示一个宽峰，（2）最好在从-+ 30°到+ 90°的磁纬度范围内观察到bKOM，并且在高纬度的发射强度为发现其强度是赤道地区的两倍，并且（3）发射强度可能受木星的亚太阳经度（SSL）控制。强度在SSL〜210°附近有一个尖峰。为了检查光源分布，将3D射线追踪方法应用于bKOM。建议：（1）通过回旋加速器马塞尔不稳定性过程产生的RX模式波将无法再现bKOM的强高纬度分量，（2）LO模式，假定是在附近的频率处产生的局部等离子体频率被认为是中高纬度地区过去和现在观测的主要模式，并且（3）发现bKOM的高纬度分量的源高度为0.9-1.5 Rj（ Rj：木星半径），并沿着L> 10的磁场线分布​​。

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