Statistical properties of Joule heating rate, electric field and conductances at high latitudes
Statistical properties of Joule heating rate, electric field and conductances at high latitudes
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高纬度地区焦耳加热速率、电场和电导的统计特性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Selkälä
中科院分区：
文献类型：
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作者：
A. Aikio;A. Selkälä
抽象的。焦耳加热率，电场和电导在高纬度电离层的统计特性进行了研究的一个独特的一个月的测量EISCAT非相干散射雷达在特罗姆瑟（66.6 cgmlat）从2006年3月6日至4月6日。这些数据是从同一个季节（接近春分），从类似的太阳黑子条件（约1.5年前的太阳黑子最小值）提供了一个很好的数据集，研究MLT和Kp的依赖性的参数具有高的时间和空间分辨率。所有参数显示出明显的MLT变化，这对于低和高Kp条件是不同的。我们的结果表明，上午部门的电导率和电导率比的磁活动增加的响应是强于晚上部门。当Kp≥3时，早晨扇区的Pedersen电导最大值和电场最大值的共同位置产生最大的焦耳加热率03-05 MLT。在晚间，一个较小的最大值出现在18 MLT。在23 MLT，这是电哈朗不连续的位置，统计观察到的最小焦耳加热率在夜面。本文的一个重要成果是分别对四个MLT扇区和两个活动水平（Kp）拟合了焦耳加热率随电场大小的函数
Abstract. Statistical properties of Joule heating rate, electric field and conductances in the high latitude ionosphere are studied by a unique one-month measurement made by the EISCAT incoherent scatter radar in Tromso (66.6 cgmlat) from 6 March to 6 April 2006. The data are from the same season (close to vernal equinox) and from similar sunspot conditions (about 1.5 years before the sunspot minimum) providing an excellent set of data to study the MLT and Kp dependence of parameters with high temporal and spatial resolution. All the parameters show a clear MLT variation, which is different for low and high Kp conditions. Our results indicate that the response of morning sector conductances and conductance ratios to increased magnetic activity is stronger than that of the evening sector. The co-location of Pedersen conductance maximum and electric field maximum in the morning sector produces the largest Joule heating rates 03–05 MLT for Kp≥3. In the evening sector, a smaller maximum occurs at 18 MLT. Minimum Joule heating rates in the nightside are statistically observed at 23 MLT, which is the location of the electric Harang discontinuity. An important outcome of the paper are the fitted functions for the Joule heating rate as a function of electric field magnitude, separately for four MLT sectors and two activity levels (Kp