中低纬电离层对行星际磁场南向翻转的响应  

Ionospheric Responses to IMF Southward Turnings in Mid- and Low-latitudes

作　　者：孙树计[1] 陈春[1,2] 丁宗华[1] 班盼盼[1] 奚迪龙[1] 

机构地区：[1]中国电波传播研究所,青岛266107 [2]西安电子科技大学理学院

出　　处：《空间科学学报》2009年第3期268-274,共7页Chinese Journal of Space Science

摘　　要：利用卫星和地面台站的历史数据,研究了中低纬电离层f_0F_2对强行星际磁场南向翻转的响应.结果表明,行星际磁场南向翻转能引起电离层扰动式响应,响应特性与纬度、季节和翻转时刻的地方时有关.在中纬,发生在夏分季和夜间的翻转能造成较强的电离层负响应,其幅度随纬度的降低而变弱,在恢复过程中存在不规则振荡;在低纬,南向翻转引起的电离层响应在夏分季较强,在冬季则较弱,且易被淹没在电离层自身的扰动中.分析指出电离层最大负响应与翻转后南向磁场极大值之间有着较好的线性关系.Using the historical data from ionosonde stations and satellite, the response of ionospheric foF2 to major Interplanetary Magnetic Field （IMF） southward turnings in mid- and low- latitudes is studied. It shows that the IMF southward turnings can cause disturbing response in the ionosphere, which depends on latitude, season and local time when the turning occurs. In mid-latitude, the ionospheric response to southward turnings in summer and equinox and by night is stronger, which fades out with latitude decreases. During the recovery phase the irregular fluctuation in the ionosphere comes forth. In low-latitude, the disturbance caused by the turnings is strong in summer and equinox and weak in winter, although it tends to be immersing into the background disturbances. It is also found that the maximal negative responses of the ionosphere is well related with the maximal negative Bz after the southward turnings linearly.

关 键 词：行星际磁场 南向翻转 电离层临界频率 暴时环流 

分 类 号：P353[天文地球—空间物理学]