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Auroral E-region neutral wind by EISCAT radar

EISCAT 雷达极光 E 区中性风

基本信息

批准号：
07640586
负责人：
NOZAWA Satonori
金额：
$ 1.47万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

Based on the data base obtained by the European Incoherent Scatter (EISCAT) radar located in the northern Scandinavia, we have studied E-region neutral wind characteristics between 95 km and 119 km obtained under geomagnetic quiet conditions over a solar cycle between November 1986 and October 1996. Data of 56 days are analyzed and grouped according to season or solar activity to investigate variations of the wind in different seasons and solar cycle conditions. Seasonal and solar cycle dependences of mean winds as well as diurnal and semidiurnal amplitudes are found, while the corresponding phases appear to be less sensitive to seasonal and solar cycle variations. No prominent seasonal nor solar cycle dependence are found for the vertical component.The zonal mean wind blows mainly eastward below 116km for all seasons, and it is the strongest (about 45ms^<-1>) in summer and the weakest (about 25ms^<-1>) in winter. The eastward mean wind amplitude below 110km are enhanced by about 15ms^<-1> during high solar activity period. The zonal mean wind turns from eastward to westward at upper E-region heights, and the turning height varies with season and solar activity. The meridional mean wind tends to shift from southward in winter to northward in summer and also from low to high solar activity periods, and its amplitude is generally less than 20ms^<-1> in this part of the E-region.Furthermore, seasonal variations for different solar activity are also investigated. It is found that the mean wind in equinox is most sensitive to solar activity in all seasons.

根据位于斯堪的纳维亚半岛北部的欧洲非相干散射(EISCAT)雷达所获得的数据库，研究了1986年11月至1996年10月一个太阳周期中，在地磁安静条件下获得的95-119公里E区中性风的特征。对56天的资料进行了分析，并按季节或太阳活动进行分组，以研究不同季节和太阳周期条件下风的变化。发现了平均风、日和半日振幅的季节和太阳周期依赖性，而相应的相位对季节和太阳周期的变化似乎不那么敏感。纬向平均风四季均以116公里以下偏东风为主，夏季最强(约45ms；-1)，冬季最弱(约25ms)。在太阳活动高峰期，110公里以下的东风平均增强约15ms^~(-1)；纬向平均风在E区上部高度由东转西，转折高度随季节和太阳活动的变化而变化。经向平均风冬季有由南向北的趋势，夏季也有由低活动期向高活动期转变的趋势，其幅值一般小于20ms^~(-1)；研究发现，春分平均风对太阳活动的影响在所有季节都最为敏感。