globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025477
Scopus记录号: 2-s2.0-85052808980
论文题名:
Seasonal and Solar Cycle Variations of Thermally Excited 630.0 nm Emissions in the Polar Ionosphere
作者: Kwagala N.K.; Oksavik K.; Lorentzen D.A.; Johnsen M.G.; Laundal K.M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:8
起始页码: 7029
结束页码: 7039
语种: 英语
英文关键词: 630.0 nm aurora ; ESR ; polar ionosphere ; thermal excitation ; thermally excited emissions
英文摘要: Solar cycle and seasonal variations have been found in the occurrence of strong thermally excited 630.0 nm emissions in the polar ionosphere. Measurements from the European Incoherent Scatter Svalbard Radar have been used to derive the thermal emission intensity. Thermally excited emissions have been found to maximize at solar maximum with peak occurrence rate of ∼40% compared to ∼2% at solar minimum. These emissions also have the highest occurrence in equinox and the lowest occurrence rate in summer and winter. There is an equinoctial asymmetry in the occurrence rate which reverses with the solar cycle. This equinoctial asymmetry is attributed to variations of the solar wind-magnetosphere coupling arising from the Russell-McPherron effect. The occurrence rate of thermal excitation emission on the dayside, at Svalbard, has been found to be higher in autumn than spring at solar maximum and the reverse at solar minimum. Enhanced electron temperatures characterize the strong thermal component for solar minimum and winter, whereas enhanced electron densities characterize the thermal component for solar maximum. The results point to solar wind-magnetosphere-ionosphere coupling as the dominant controlling process. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113421
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, The University Centre in Svalbard, Longyearbyen, Norway; Center for Space Science and Engineering Research (Space@VT), Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Tromsø Geophysical Observatory, UiT - The Arctic University of Norway, Afghanistan

Recommended Citation:
Kwagala N.K.,Oksavik K.,Lorentzen D.A.,et al. Seasonal and Solar Cycle Variations of Thermally Excited 630.0 nm Emissions in the Polar Ionosphere[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)
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