DOI: 10.1002/2018JA025258
Scopus记录号: 2-s2.0-85047624561
论文题名: Zonally Symmetric Oscillations of the Thermosphere at Planetary Wave Periods
作者: Forbes J.M. ; Zhang X. ; Maute A. ; Hagan M.E.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 4110
结束页码: 4128
语种: 英语
英文关键词: IT
; nonlinear interaction
; PW
; S0
; tide
; TIEGCM
英文摘要: New mechanisms for imposing planetary wave (PW) variability on the ionosphere-thermosphere system are discovered in numerical experiments conducted with the National Center for Atmospheric Research thermosphere-ionosphere-electrodynamics general circulation model. First, it is demonstrated that a tidal spectrum modulated at PW periods (3–20 days) entering the ionosphere-thermosphere system near 100 km is responsible for producing ±40 m/s and ±10–15 K PW period oscillations between 110 and 150 km at low to middle latitudes. The dominant response is broadband and zonally symmetric (i.e., “S0”) over a range of periods and is attributable to tidal dissipation; essentially, the ionosphere-thermosphere system “vacillates” in response to dissipation of the PW-modulated tidal spectrum. In addition, some specific westward propagating PWs such as the quasi-6-day wave are amplified by the presence of the tidal spectrum; the underlying mechanism is hypothesized to be a second-stage nonlinear interaction. The S0 total neutral mass density (ρ) response at 325 km consists of PW period fluctuations of order ±3–4%, roughly equivalent to the day-to-day variability associated with low-level geomagnetic activity. The variability in ρ over short periods (∼< 9 days) correlates with temperature changes, indicating a response of hydrostatic origin. Over longer periods ρ is also controlled by composition and mean molecular mass. While the upper-thermosphere impacts are modest, they do translate to more significant changes in the F region ionosphere. ©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/113918
Appears in Collections: 气候减缓与适应
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作者单位: Ann and H. J. Smead Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO, United States; High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States; Department of Physics, Utah State University, Logan, UT, United States
Recommended Citation:
Forbes J.M.,Zhang X.,Maute A.,et al. Zonally Symmetric Oscillations of the Thermosphere at Planetary Wave Periods[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)