Greer K R, Eastes Richard, Solomon Stan, McClintock William, Burns Alan, Rusch David
University of Colorado Boulder-LASP Boulder CO USA.
National Center for Atmospheric Research-HAO Boulder CO USA.
J Geophys Res Space Phys. 2020 Jun;125(6):e2020JA027810. doi: 10.1029/2020JA027810. Epub 2020 Jun 5.
Here we compare the global-scale morphology of Earth's the Far-Ultraviolet (FUV) emissions observed by NASA's Global-scale Observations of Limb and Disk (GOLD) mission to those modeled using the Global Airglow (GLOW) code with atmospheric parameters provided by Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIEGCM). The O S oxygen (135.6 nm) and N Lyman-Birge-Hopfield (LBH) emissions are observed over the Western hemisphere every 30 min by the GOLD instrument. The FUV brightness of the thermosphere-ionosphere is expected to vary in systemic ways with respect to geophysical parameters, solar energy input from above, and terrestrial weather input from below. In this paper we examine the O S oxygen emission and the N LBH emission brightnesses with local time, latitude, season, tides, geomagnetic activity, and solar activity based on GOLD observations and GLOW modeling. Early GOLD observations indicate that the model effectively reproduces the brightness variations with local time and latitude but is biased low in magnitude. However, the TIEGCM is unable to accurately represent the extraordinary nighttime equatorial ionization anomaly observed by GOLD. It is also expected from these results that the signal from geomagnetic storms may obscure tidal signals.
在此，我们将美国国家航空航天局（NASA）的全球边缘和盘面观测（GOLD）任务所观测到的地球远紫外线（FUV）发射的全球尺度形态，与使用全球气辉（GLOW）代码、并结合热层-电离层-电动力学通用环流模型（TIEGCM）提供的大气参数所模拟的形态进行比较。GOLD仪器每30分钟在西半球观测一次氧的OI（135.6纳米）发射和氮的莱曼-比尔格-霍普菲尔德（LBH）发射。热层-电离层的FUV亮度预计会随着地球物理参数、来自上方的太阳能输入以及来自下方的地面天气输入而以系统的方式变化。在本文中，我们基于GOLD观测和GLOW模拟，研究了OI氧发射和N LBH发射亮度随地方时、纬度、季节、潮汐、地磁活动和太阳活动的变化情况。早期的GOLD观测表明，该模型有效地再现了亮度随地方时和纬度的变化，但幅度上存在偏低偏差。然而，TIEGCM无法准确呈现GOLD观测到的异常夜间赤道电离异常现象。从这些结果还可以预期，地磁风暴的信号可能会掩盖潮汐信号。
