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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the statistical relation between ion upflow and naturally enhanced ion-acoustic lines observed with the EISCAT Svalbard radar
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On the statistical relation between ion upflow and naturally enhanced ion-acoustic lines observed with the EISCAT Svalbard radar

机译：离子上升气流和之间的统计关系自然地增强离子声波线观察雷达的EISCAT斯瓦尔巴特群岛

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摘要

We have investigated characteristics of ion upflow and naturally enhanced ion-acoustic lines (NEIALs) based on the European Incoherent Scatter (EISCAT) Svalbard radar (ESR) data continuously obtained between March 2007 and February 2008. For the ion upflow study we have used approximately 78,000 field-aligned profiles obtained with the ESR. For the NEIAL study we have identified approximately 1500 NEIALs in the ESR data at altitudes between 100 and 500 km. The occurrence frequency of ion upflow shows two peaks, at about 0800 and 1300 magnetic local time (MLT), while only one strong peak is seen around 0900 MLT for NEIALs. The upward ion flux also has only one peak around 1100-1300 MLT. The occurrence frequency of ion upflow varies strongly over season. It is higher in winter than in summer, whereas NEIALs are more frequent in summer than in winter. NEIALs frequently occur under high geomagnetic activity and also high solar activity conditions. Approximately 10% of NEIALs in the F region ionosphere were accompanied by NEIALs in the E region (occurred at altitudes below 200 km). About half of the E region enhanced echoes did not have an F region counterpart. Upshifted NEIALs dominate in the E region whereas downshifted NEIALs are usually stronger above an altitude of 300 km. The high occurrence frequency of NEIALs in the prenoon region (0800-1000 MLT) might be associated with acceleration of thermal ions to suprathermal ones. At the same MLT and geomagnetic latitude suprathermal ions and broadband extremely low frequency (BBELF) wave activity have been observed, according to previous studies.
机译：我们已经调查了离子上升气流的特征和自然增强离子声波基于欧洲非相干散射(NEIALs)斯瓦尔巴特群岛(EISCAT)雷达(ESR)数据不断获得2007年3月至2008年2月。离子的上升气流研究我们使用大约78000 field-aligned概要文件用ESR获得。已经确定了大约1500 NEIALs吗ESR数据高度100至500公里。发生的频率离子向上流显示了两个山峰,当地时间0800年和1300年的磁性(MLT),而只有一个强峰是见过0900 MLT NEIALs。只有一个峰值约1100 - 1300匝。离子向上流的发生频率是不同的强烈的季节。在夏天,而NEIALs更频繁夏天比冬天。在高地磁活动也高太阳活动的条件。NEIALs电离层F地区伴随着NEIALs (E地区发生海拔低于200公里)。没有一个F地区地区增强回声同行。地区而幅度已经NEIALs通常更强的海拔300公里以上。发生的频率在prenoon NEIALs0800 - 1000区域(MLT)可能是相关的热离子suprathermal加速度的人。suprathermal离子和宽带极低频率(BBELF)波活动观察,根据先前的研究。

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