Comparison of the magnetic equivalent convection direction and ionospheric convection observed by the SuperDARN radars
Comparison of the magnetic equivalent convection direction and ionospheric convection observed by the SuperDARN radars
复制标题
SuperDARN雷达观测到的磁等效对流方向与电离层对流的比较
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
J. Watermann
中科院分区：
文献类型：
--
作者：
L. Benkevitch;A. Koustov;Jun Liang;J. Watermann
抽象的。如果假设磁等效对流矢量 (MEC) 对应于对流方向，SuperDARN 雷达和高纬度磁力计观测可用于统计调查磁力计数据对流方向估计的质量。统计数据包括五整天、不同季节约 75 000 次联合单独测量。结果表明，MEC 和电离层对流之间的最佳（最差）一致性发生在阳光照射的夏季（黑暗、冬季）电离层中。总体而言，MEC 方向在至少约 55% 的点上是合理的（与 SuperDARN 方向偏差小于 45°），并且对于极光椭圆形的纬度来说更好。就地磁时间而言，一致性最好（最差）的是黄昏（清晨）区段。讨论了 MEC 和电离层对流方向差异的可能原因。
Abstract. SuperDARN radar and high-latitude magnetometer observations are used to statistically investigate quality of the convection direction estimates from magnetometer data if assumption is made that the magnetic equivalent convection vector (MEC) corresponds to the convection direction. The statistics includes five full days, ~75 000 of joint individual measurements for different seasons. It is demonstrated that the best (worst) agreement between the MEC and ionospheric convection occurs for the sunlit, summer (dark, winter) ionosphere. Overall, the MEC direction is reasonable (deviates less than 45° from the SuperDARN direction) in at least ~55% of points and it is better for the latitudes of the auroral oval. In terms of the magnetic local time, the agreement is the best (worst) in the dusk (early morning) sector. Possible reasons for differences between the MEC and ionospheric convection directions are discussed.