globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024744
Scopus记录号: 2-s2.0-85040052014
论文题名:
How Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere?
作者: Kwagala N.K.; Oksavik K.; Lorentzen D.A.; Johnsen M.G.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:1
起始页码: 698
结束页码: 710
语种: 英语
英文关键词: cusp ; ESR ; polar ionosphere ; thermally excited 630 nm
英文摘要: This paper studies thermally excited emissions in the polar ionosphere derived from European Incoherent Scatter Svalbard radar measurements from the years 2000–2015. The peak occurrence is found around magnetic noon, where the radar observations show cusp-like characteristics. The ionospheric, interplanetary magnetic field and solar wind conditions favor dayside magnetic reconnection as the dominant driving process. The thermal emissions occur 10 times more frequently on the dayside than on the nightside, with an average intensity of 1–5 kR. For typical electron densities in the polar ionosphere (2 × 1011 m−3), we find the peak occurrence rate to occur for extreme electron temperatures (>3000 K), which is consistent with assumptions in literature. However, for extreme electron densities (>5 × 1011 m−3), we can now report on a completely new population of thermal emissions that may occur at much lower electron temperatures (∼2300 K). The empirical atmospheric model (NRLMSISE-00) suggests that the latter population is associated with enhanced neutral atomic oxygen densities. ©2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114807
Appears in Collections:气候减缓与适应

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作者单位: Birkeland Centre for Space Science, University of Bergen, Bergen, Norway; Birkeland Centre for Space Science, University Centre in Svalbard, Longyearbyen, Norway; Now at Center for Space Science and Engineering Research (Space@VT), Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Tromsø Geophysical Observatory, UiT-Arctic University of Norway, Tromso, Norway

Recommended Citation:
Kwagala N.K.,Oksavik K.,Lorentzen D.A.,et al. How Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere?[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
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