...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Time resolved N_2 triplet state vibrational populations and emissions associated with red sprites
【24h】

Time resolved N_2 triplet state vibrational populations and emissions associated with red sprites

机译：时间已解决的N_2三重态状态振动群和与红色精灵相关的排放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The results of a quasi-electrostatic electron heating model were combined with a time dependent N_2 vibrational level population model to simulate the spectral distributions and absolute intensities observed in red sprites. The results include both N_2 excited state vibrational level populations and time profiles of excited electronic state emission. Due to the long atmospheric paths associated with red sprite observations, atmospheric attenuation has a strong impact on the observed spectrum. We present model results showing the effect of atmospheric attenuation as a function of wavelength for various conditions relevant to sprite observations. In addition, our model results estimate the variation in the relative intensities of a number of specific N_2 emissions in sprites (1PG, 2PG, and VK) in response to changes in observational geometry. A recent sprite spectrum, measured from the Wyoming Infrared Observatory (WIRO) on Jelm Mountain, during July, 1996, has been analyzed and includes N_2 1PG bands down to v' = 1. In addition to N_2 1PG, our analysis of this spectrum indicates the presence of spectral features which are attributable to N_2~+ Meinel emission. However, due to the low intensity in the observed spectrum and experimental uncertainties, the presence of the N_2~+(A~2Π_u) should be considered preliminary. The importance of both the populations of the lower levels of the N_2(B~3Π_g) and the N_2(B~3Π_g)/N_2~+(A~2Π_g) population ratio in the diagnosis of the electron energies present in red sprites is discussed. While the current spectral analysis yields a vibrational distribution of the N_2(B~3Π_g) which requires an average electron energy of only 1-2 eV, model results do indicate that the populations of the lower levels of the N_2(B~3Π_g) will increase with increases in the electron energy primarily due to cascade. Considering the importance of the populations of the lower vibrational levels, we are beginning to analyze additional sprite spectra, measured at higher resolution, which contain further information on the population of B(v = 1).
机译：准静电电子加热模型的结果与时间依赖性N_2振动水平群体模型组合，以模拟红色精灵中观察到的光谱分布和绝对强度。结果包括N_2激发态振动水平群体和激发电子状态发射的时间概况。由于与红色薄膜观察相关的长大气路径，大气衰减对观察到的光谱产生了强烈影响。我们提出了模型结果，显示了大气衰减的效果，作为与精灵观测相关的各种条件的波长的函数。此外，我们的模型结果估计响应于观察几何形状的变化，估计精灵（1pg，2pg和vk）的许多特定N_2排放的相对强度的变化。在1996年7月的jelm山上的Wyoming红外天文台（WiRO）中测量了最近的闪光谱，并将N_2 1PG频段向下分析，包括N_2 1PG，我们对该频谱的分析表明可归因于N_2〜+ Meinel发射的光谱特征的存在。然而，由于观察到的光谱和实验性不确定性的低强度，应考虑N_2〜+（A〜2π_U）的存在。讨论了N_2（B〜3π_G）和N_2（B〜3π_G）/ N_2〜+（A〜2π_G）概率在红色精灵中存在的电子能量诊断中的较低水平的重要性。虽然电流光谱分析产生了N_2（B〜3π_G）的振动分布，其需要仅为1-2eV的平均电子能量，而模型结果表明N_2（B〜3π_G）的较低级别的群体随着级联而增加电子能源的增加。考虑到较低振动水平的群体的重要性，我们开始分析额外的精灵谱，以较高的分辨率测量，其含有关于B的群体的进一步信息（V = 1）。

著录项

  • 来源
  • 作者

    J. S. Morrill; E. J. Bucsela; V. P. Pasko; S. L. Berg; M. J. Heavner; D. R. Moudry; W. M. Benesch; E. M. Wescott; D. D. Sentman;

  • 作者单位

    E. O. Hulburt Center for Space Research Naval Research Laboratory Washington DC U.S.A.;

    E. O. Hulburt Center for Space Research Naval Research Laboratory Washington DC U.S.A.;

    STAR Laboratory Stanford University Stanford CA U.S.A.;

    Computational Physics Inc. Fairfax VA U.S.A.;

    Geophysical Institute University of Alaska Fairbanks Fairbanks AL U.S.A.;

    Geophysical Institute University of Alaska Fairbanks Fairbanks AL U.S.A.;

    Institute for Physical Science and Technology University of Maryland Colelge Park MD U.S.A.;

    Geophysical Institute University of Alaska Fairbanks Fairbanks AL U.S.A.;

    Geophysical Institute University of Alaska Fairbanks Fairbanks AL U.S.A.;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号