DOI: 10.1029/2018JA025288
Scopus记录号: 2-s2.0-85052806381
论文题名: Observations of Spatial Variations in O/N2 During an Auroral Substorm Using the Multichannel Downlooking Camera on the VISIONS Rocket
作者: Hecht J.H. ; Clemmons J.H. ; Conde M.G. ; Hampton D.L. ; Michell R.G. ; Rowland D.E. ; Pfaff R.F. ; Walterscheid R.L.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 8 起始页码: 7089
结束页码: 7105
语种: 英语
英文摘要: At 0821 UT on 7 February 2013, during an auroral substorm, the NASA VISIONS rocket was launched northward from Poker Flat Research Range on a flight to approximately 750-km altitude that terminated in the Arctic Ocean. A subpayload jettisoned on the up leg carried a multichannel optical imager that looked downward and observed the auroral emission through four narrow passband filters. Three of the channels had sufficiently strong signal to allow a measure of the time evolution of the horizontal extent of the electron aurora and changes in the ratio of the column O to the column N2. These data revealed rather rapid changes in this measure of composition over an area larger than would be expected from the changes expected from particle and Joule heating. Although such rapid large changes have been observed previously, and Christensen et al. (1997, https://doi.org/10.1029/97JA01800) had hypothesized that they were due to enhanced turbulent diffusion, this imaging experiment is the first to show their evolution over a large area. On the down leg the camera was able to see the vertical spatial extent of the auroral emission which is consistent with the decrease in O/N2 seen in the downlooking data. The change in this ratio with altitude suggests the deposition of an additional number of low-energy electrons that would cause a larger decrease in that ratio at higher altitudes. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113428
Appears in Collections: 气候减缓与适应
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作者单位: Space Science Applications Laboratory, The Aerospace Corporation, El Segundo, CA, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Astronomy, University of Maryland, College Park, MD, United States
Recommended Citation:
Hecht J.H.,Clemmons J.H.,Conde M.G.,et al. Observations of Spatial Variations in O/N2 During an Auroral Substorm Using the Multichannel Downlooking Camera on the VISIONS Rocket[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)