The maximum peak of the directional derivative of the SuperDARN convection flow has been proposed as a proxy for the open/closed magnetic field line boundary (OCB) and this has been evaluated using data from the ultraviolet imagers collected during the steady southward Interplanetary Magnetic Field (IMF) condition. However, the technique ignores the contribution of ionospheric vorticity in determining the peak of the directional derivative of SuperDARN convection flow. In this paper these effects have been considered when identifying the OCB in the night sector, calculated using the directional derivatives of SuperDARN convection flow during the active substorm interval which occurred on October 14, 2001. Statistical comparison of the latitudes of the OCB, as estimated from the peaks of the directional derivative of the SuperDARN convection flow, determined with and without considering the relative maxima and minima vorticity, and as provided by images taken by the two Far Ultraviolet (FUV) Spectral Imagers onboard the IMAGE spacecraft (SI-12 and SI-13) indicates that the modified approach of the directional derivative of the SuperDARN convection flow may be used as an OCB proxy during active geomagnetic activity.

已经提出将SuperDARN对流的方向导数的最大峰值作为开/关磁场线边界（OCB）的代表，并且已使用在稳定的南向星际磁场期间收集的来自紫外线成像器的数据进行了评估（ IMF）条件。但是，该技术在确定SuperDARN对流流动的方向导数的峰值时忽略了电离层涡旋的贡献。本文在识别夜间区域的OCB时已经考虑了这些影响，这是使用2001年10月14日发生的活跃亚暴间隔内SuperDARN对流流动的方向导数计算得出的。OCB纬度的统计比较从SuperDARN对流的方向导数的峰值，