Mapping thermospheric winds in the auroral zone
Mapping thermospheric winds in the auroral zone
复制标题
绘制极光区的热层风图
DOI：
10.1029/95gl02437
复制
发表时间：
1995
影响因子：
5.2
通讯作者：
Roger Smith
中科院分区：
文献类型：
--
作者：
M. Conde;Roger Smith
研制了一种新的全天空成像法布里-珀罗（ASIFP）光谱仪，用于极光区高层大气风场和温度场的地面测绘。尽管存在用于大气研究的几种其他ASIFP光谱仪[Rees等人，1984; Sekar等人，1993; Biondi等人，1995]这些仪器都是用固定光学间隙的标准具操作的，这种方法在极光强度梯度存在的情况下可能会出现误差。在该仪器中，在一个干涉阶数上周期性地扫描标准具板间距，并且将检测到的每个光子分配给波长间隔，该波长间隔根据其在检测器上的到达位置和在检测时间占主导的标准具板间距两者来确定。以这种方式积累的光谱不会因空间强度梯度而失真。在1994/95年冬季，在阿拉斯加的扑克平原研究范围进行了初步的λ630 nm观测。为了说明我们在这项研究中观察到的一些特征，我们提出了1994年12月7日晚上的视线风估计。背景风与Sica等人[1986]先前提出的平均值相匹配，并且与主要由电离层等离子体对流通过离子阻力产生的动量沉积驱动的风相一致。小规模的曲率和发散功能也可辨别，并进行了讨论。
A new all-sky imaging Fabry-Perot (ASIFP) spectrometer has been developed for ground-based mapping of upper atmospheric wind and temperature fields in the auroral zone. Although several other ASIFP spectrometers exist for atmospheric studies [Rees et al., 1984; Sekar et al., 1993; Biondi et al., 1995] these instruments have all operated with etalons of fixed optical gap, a method potentially subject to errors in the presence of auroral intensity gradients. In this instrument the etalon plate spacing is scanned periodically over one order of interference and each photon detected is assigned to a wavelength interval which is determined from both its arrival location on the detector and the etalon plate spacing prevailing at the detection time. Spectra accumulated this way are not distorted by spatial intensity gradients. Preliminary λ630 nm observations were made during the winter of 1994/95 from Poker Flat Research Range, Alaska. To illustrate some of the features we have observed in this study we present line-of-sight wind estimates derived for the night of December 7, 1994. The background wind matches averages presented previously by Sica et al. [1986] and is consistent with winds driven principally by momentum deposition from ionospheric plasma convection through ion-drag. Smaller scale curvature and divergence features are also discernable and are discussed.