Coherent radar estimates of average high-latitude ionospheric Joule heating
Coherent radar estimates of average high-latitude ionospheric Joule heating
复制标题
高纬度电离层平均焦耳热的相干雷达估计
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
E. Nielsen
中科院分区：
文献类型：
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作者：
M. Kosch;E. Nielsen
斯堪的纳维亚双极光雷达实验（STARE）和瑞典和英国雷达实验（SABRE）双基地相干雷达系统已被用来估计斯堪的纳维亚半岛上空组合地理纬度范围63.8°-72.6°（校正地磁纬度61.5°-69.3°）内电离层焦耳加热的空间和时间变化。对 1982 年至 1986 年期间所有四台雷达的 173 天良好观测进行了分析，以估计平均电离层电场与时间和纬度的关系。 Spiro 等人的电离层 Pedersen 电导率 AE 相关经验模型。 (1982) 已被用来计算焦耳热。焦耳热的纬度和日变化以及估计的平均半球加热 1.7 × 1011 W 与早期结果非常一致。研究发现平均焦耳热随 AE、AU 和 AL 指数线性变化，并且与 Kp 呈二阶幂律变化。还检查了平均焦耳热作为行星际磁场方向和大小的函数。首次表明，电离层电场强度以及焦耳热随着 Bz 负值（向南）的增加而增加。
The Scandinavian Twin Auroral Radar Experiment (STARE) and Sweden and Britain Radar Experiment (SABRE) bistatic coherent radar systems have been employed to estimate the spatial and temporal variation of the ionospheric Joule heating in the combined geographic latitude range 63.8°-72.6° (corrected geomagnetic latitude 61.5°-69.3°) over Scandinavia. The 173 days of good observations with all four radars have been analyzed during the period 1982 to 1986 to estimate the average ionospheric electric field versus time and latitude. The AE dependent empirical model of ionospheric Pedersen conductivity by Spiro et al. (1982) has been used to calculate the Joule heating. The latitudinal and diurnal variation of Joule heating as well as the estimated mean hemispherical heating of 1.7 × 1011 W are in good agreement with earlier results. Average Joule heating was found to vary linearly with the AE, AU, and AL indices and as a second-order power law with Kp. The average Joule heating was also examined as a function of the direction and magnitude of the interplanetary magnetic field. It has been shown for the first time that the ionospheric electric field magnitude as well as the Joule heating increase with increasingly negative (southward) Bz .