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.

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.发现平均风以及昼夜幅度的季节性和太阳周期依赖性，而相应的相位似乎对季节性和太阳周期变化不太敏感。垂直组件没有发现突出的季节性或太阳周期依赖性。所有季节的纬向平均风吹以向东吹到116公里以下，并且夏季是最强的（约45ms^<-1>），冬季是最弱的（约25ms^<-1>）。在高太阳能活动期间，向东平均风幅度低于110公里。在e区高度上，区域平均风从向西转向向西，转弯高度随季节和太阳活动而变化。子午平均风倾向于从冬季向北转移到夏季向北转移，也从低太阳能活动期转移到高太阳能活动期，其幅度通常小于20ms^<-1>在E-Region的这一部分。还研究了不同太阳能活动的季节性变化。发现春分中的平均风对所有季节的太阳能活动最敏感。