POYNTING FLUX MEASUREMENTS ON A SATELLITE - A DIAGNOSTIC-TOOL FOR SPACE RESEARCH
POYNTING FLUX MEASUREMENTS ON A SATELLITE - A DIAGNOSTIC-TOOL FOR SPACE RESEARCH
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DOI：
10.1029/90ja01837
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发表时间：
1991-01-01
影响因子：
2.8
通讯作者：
VICKREY, JF
中科院分区：
文献类型：
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作者：
KELLEY, MC;KNUDSEN, DJ;VICKREY, JF
第一次卫星观测的准直流坡印廷通量的总场对齐的组成部分，提出了两个通过极地地区，一个在中午部门和一个在下午。由于电子沉淀的能量输入也被提出。在中午通过的向下坡印廷通量在极光椭圆的动能输入率相媲美。6 ergs/（cm ~ 2·s）的峰值电磁能量输入率等于峰值粒子输入，而沿轨迹的积分电磁值为粒子的积分电磁值的沿着。在下午通过的峰值电磁能量输入也约为6尔格/（厘米2秒），但峰值粒子能量是这个值的6倍。平均电磁输入为通过的粒子输入的10%。在这项研究中，我们只能在有限的尺度范围内测量坡印廷通量，因此无法确定对极冠总能量收支的贡献。这两个通道都显示出向上坡印廷通量的小区域，表明中性风力发电机。还有证据表明，在中午的一部分时间，外部发电机的作用与现有的风场相反，因为坡印亭通量大于单独从电场测量中估计的焦耳加热（即，来自SIGMA-pEPSILON-2）。在推导坡印廷定理的地球物理的情况下，我们还提出了一个证明，地面磁力计系统主要响应霍尔电流，这并不依赖于几何抵消所产生的场之间的彼得森和场对齐的电流。
The first satellite observations of the total field-aligned component of the quasi-dc Poynting flux are presented for two passes over the polar region, one in the noon sector and one in the afternoon. The energy input due to electron precipitation is also presented. In the noon pass the downward Poynting flux in the auroral oval was comparable to the kinetic energy input rate. The peak electromagnetic energy input rate of 6 ergs/(cm2 s) equaled the peak particle input while the integrated electromagnetic value along the trajectory was 60% that of the particles. In the afternoon pass the peak electromagnetic energy input was also about 6 ergs/(cm2 s), but the peak particle energy was 6 times this value. The average electromagnetic input was 10% of the particle input for the pass. In this study we can measure the Poynting flux only over a limited range of scale sizes; thus the contribution to the total energy budget in the polar cap cannot be determined. Both passes show small regions characterized by upward Poynting flux suggesting a neutral wind dynamo. There is also evidence during part of the noontime pass that the external generator acted in opposition to an existing wind field since the Poynting flux was greater than the estimate of Joule heating from the electric field measurement alone (i.e., from SIGMA-pEPSILON-2). In the course of deriving Poynting's theorem for the geophysical case we also present a proof that ground magnetometer systems respond primarily to the Hall current which does not depend upon geometric cancellation between the field generated by Pedersen and field-aligned currents.