The study investigates the relationship between Super Dual Auroral Radar Network (SuperDARN) high‐frequency (HF) radar velocities measured at intermediate ranges of 600–1,000 km from the radar and the E × B plasma drift. Two approaches are implemented. First, a 3‐h interval of SuperDARN Rankin Inlet (RKN) radar measurements and Resolute Bay incoherent scatter radar RISR‐C measurements in nearly coinciding directions is investigated to show that (1) HF echoes with low velocities (less than 200 m/s) are often detected when E × B drifts are in excess of 1,000 m/s; (2) high‐velocity HF echoes from the E region have velocities somewhat below the expected values of the ion‐acoustic speed of the plasma and the HF line‐of‐sight velocity does not show a tendency for an increase at the largest E × B drifts; (3) for E region echoes, 12 MHz velocities are slightly larger than those at 10 MHz; and (4) 12‐MHz echoes are often received from the electrojet heights while 10‐MHz echoes are received from the F region heights so that the observed velocities are quite different with the latter reflecting the E × B drift of the plasma. In the second approach, velocities of 10‐ and 12‐MHz RKN echoes are compared for a large data set comprising several months of observations to show that occurrence of 12‐MHz low‐velocity echoes is fairly common (up to 25% of the time) whenever the plasma drifts are fast. Under this condition, the SuperDARN cross polar cap potential is underestimated, on average, by ~4 kV.

中文翻译：

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SuperDARN回波在中等雷达范围内的速度

该研究调查了在距雷达600-1,000 km的中间范围内测得的超双极光雷达网络（SuperDARN）高频（HF）雷达速度与E  ×  B等离子体漂移之间的关系。实现了两种方法。首先，研究了在几乎一致的方向上3小时间隔的SuperDARN朗肯入口（RKN）雷达测量和Resolute Bay非相干散射雷达RISR-C测量的结果，以显示（1）低速（小于200 m / s）HF回波）通常在E  ×  B漂移超过1000 m / s时被检测到; （2）来自E的高频HF回波该区域的速度略低于等离子体的离子声速的预期值，并且在最大E  ×  B漂移下，HF视线速度没有显示出增加的趋势；（3）对于E区回波，12 MHz的速度略大于10 MHz的速度；（4）通常从电喷高度接收到12MHz的回波，而从F区域的高度接收到10MHz的回波，因此观测到的速度有很大不同，后者反映了E  ×  B血浆漂移。在第二种方法中，比较了包含数月观察结果的大型数据集的10MHz和12MHz RKN回波的速度，以显示12MHz低速回波的发生是相当普遍的（最多25％的时间） ）只要等离子漂移快。在这种情况下，SuperDARN交叉极帽电势平均低估了约4 kV。