Proton temperatures in the ring current from ENA images and in situ measurements
Proton temperatures in the ring current from ENA images and in situ measurements
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DOI：
10.1029/2005gl023481
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发表时间：
2005-08
影响因子：
5.2
通讯作者：
X. X. Zhang-X.;J. D. Perez;T. Chen;C. Wang;P. Brandt;D. Mitchell;Y. Wang
中科院分区：
文献类型：
--
作者：
X. X. Zhang-X.;J. D. Perez;T. Chen;C. Wang;P. Brandt;D. Mitchell;Y. Wang
利用IMAGE卫星上的高能中性原子（HENA）成像仪获得的不同能量通道的ENA图像，反演了环电流中的离子赤道通量分布，并以此推算了环电流中的等离子体离子温度。在2000年8月12日的强风暴恢复阶段的早期，推断的环电流的离子温度与从现场LANL MPA测量推断的值是一致的。离子温度在午夜后/黎明前扇区显示出峰值，与赤道离子分布中的峰值一致。然而，温度比离子通量更对称，这意味着，至少在能谱的这一部分中，密度变化对压力梯度有主要贡献。
Ion equatorial flux distributions, inverted from energetic neutral atom (ENA) images in different energy channels obtained by the HENA imager on the IMAGE satellite, are used to deduce the plasma ion temperature in the ring current. During the early period of the recovery phase of the strong storm on 12 August 2000, the deduced ion temperatures of the ring current are consistent with the values inferred from in situ LANL MPA measurements. The ion temperatures show a peak in the post‐midnight/pre‐dawn sector coincident with the peak in the equatorial ion distributions. The temperature, however, is more symmetrical than the ion flux implying that, at least in this part of the energy spectrum, the density variations make the major contribution to pressure gradients.