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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Average field-aligned ion velocity over the EISCAT radars
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Average field-aligned ion velocity over the EISCAT radars

机译：平均field-aligned EISCAT离子速度

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摘要

Long-term measurements by the European Incoherent Scatter (EISCAT) radars at Troms? (69.6°N, 19.2°E) and Svalbard (78.2°N, 16.0°E) are used to determine the climatology of the field-aligned ion velocity in the F region ionosphere (175-475 km) at high latitudes. The average ion velocity is calculated at various altitudes and times of day. The magnitude of the average field-aligned ion velocity is on the order of 10 m/s, similar to previous results at middle and low latitudes. The results obtained for the two radars are in good agreement. During daytime the direction of the average field-aligned ion velocity changes from downward to upward around 350 km, while during nighttime it is upward at all heights. The reversal height of the daytime field-aligned ion velocity depends on solar activity. It is elevated by more than 100 km during high solar flux periods compared to low solar flux periods. The Thermosphere Ionosphere Electrodynamics General Circulation Model reproduces the main features of the field-aligned ion velocity climatology. The simulation results suggest that the plasma pressure gradient force and gravity force play a dominant role for the daytime field-aligned ion motion. The height pattern of the field-aligned ion velocity tends to be preserved in different solar activity conditions at constant pressure surfaces, but not at constant altitudes, which explains the observed dependence on solar activity. During nighttime, the effect of the neutral wind dominates the field-aligned ion velocity.
机译：长期由欧洲非相干测量医疗队(EISCAT)雷达at Troms ?19.2°E)和斯瓦尔巴特群岛(78.2°N, 16.0°E)使用确定field-aligned的气候学离子速度F地区电离层(175 - 475年公里)在高纬度地区。计算在不同的时期和不同的高度的的一天。离子的速度是10 m / s,相似在中、低纬度地区以前的结果。获得的结果为两个雷达良好的协议。平均field-aligned离子速度变化从下降到上升约350公里,时间在夜间它上升高度。逆转白天field-aligned离子的高度速度取决于太阳活动。在高太阳能升高超过100公里通量时期相比,低太阳能通量。热大气层电离层电动力学繁殖的主要环流模型field-aligned离子的特征速度气候学。等离子体压强梯度力和重力白天力量发挥主导作用field-aligned离子运动。field-aligned离子速度往往是保存在不同太阳活动的条件在恒压下表面,但不是恒定的高度,这就解释了观察到的太阳活动的依赖。中性风的影响占主导地位field-aligned离子速度。

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