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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Charged particle periodicities in Saturn's outer magnetosphere
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Charged particle periodicities in Saturn's outer magnetosphere

机译：带电粒子在土星外层的周期的研究磁气圈

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A Lomb periodogram analysis is applied to charged particle data from the LEMMS/CHEMS instruments on the Cassini spacecraft. The data represent count rates, averaged within 30 min bins, from electrons (28–330 keV) and protons and oxygen ions (2.8–236 keV) during 350 days in 2005 and all 365 days in 2006. Sun effects, spacecraft maneuvers, and measurements within 20 RS of Saturn were removed from the data prior to analysis. The main peaks in the frequency periodograms (or power spectra) were found within a frequency window from 9.5 hours to 12.5 hours. For signal-to-noise ratios exceeding 8, the periodograms within this window reveal a consistent peak near 10.80 hours (10 hours 48 min 36 sec) for all the charged particles regardless of energy or species. Even for lower signal-to-noise ratios, a peak near this period is generally present. The Lomb analyses are consistent with an azimuthal anomaly that rotates with a period of 10.80 hours.
机译：一个随着周期图分析是应用于带电粒子LEMMS /化学仪器的数据卡西尼宇宙飞船。率、平均30分钟内箱电子(28 - 330 keV)和质子和氧气离子(2.8 -236 keV)在2005年和在350天所有在2006年365天。在20 RS的演习,测量土星是之前从数据中删除分析。周期图(或功率谱)内被发现一个频率窗口从9.5小时到12.5小时。对于信噪比率超过8,在这个窗口显示一个周期图一致的峰值附近10.80小时(10小时48分钟36秒)为所有带电粒子的能量或物种。信噪比,这附近的一个高峰时期通常的礼物。符合一个旋转方位异常一段时间为10.80小时。

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