globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025399
Scopus记录号: 2-s2.0-85050281857
论文题名:
EISCAT Observation of Wave-Like Fluctuations in Vertical Velocity of Polar Mesospheric Summer Echoes Associated With a Geomagnetic Disturbance
作者: Lee Y.-S.; Kim Y.H.; Kim K.-C.; Kwak Y.-S.; Sergienko T.; Kirkwood S.; Johnsen M.G.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:6
起始页码: 5182
结束页码: 5194
语种: 英语
英文关键词: D region ; EISCAT ; geomagnetic storm ; gravity wave ; PMSE
英文摘要: By analyzing a data set from the European Incoherent SCATter (EISCAT) Very High Frequency (VHF) radar at Tromsø, we find that both radar reflectivity and upward ion velocity in a polar mesospheric summer echo (PMSE) layer simultaneously increased at the commencement of a local geomagnetic disturbance, which occurred at midnight on 9 July 2013. The onset of the upward velocity was followed by periodic repetition of ~5 min during the initial 30-min stage, and then at later stage the vertical velocity oscillated with ~7- and ~20-min periodicities at 85- to 90-km altitudes. The ~5-min periodicity is close to the buoyancy period, and the ~7- and ~20 min periodicities are consistent with gravity waves, thus suggesting that gravity waves can be generated by the effects of the geomagnetic disturbance. On the other hand, the variation of PMSE intensity (85–90 km) was in phase with fluctuations of electron densities (90–110 km) with ~12- and ~13-min periodicities at the initial and later stages, respectively. The initial creation of PMSE can be attributed to both the sudden onset of particle precipitation and ice particles produced by adiabatic cooling during the rapid updraft, as detected by large upward velocity. Our periodogram analysis suggests that variations of PMSE intensity seem to follow the same periods with E region electron density, which is moduled by energetic electron precipitation, while vertical velocity oscillates at atmospheric gravity wave periods. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113756
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作者单位: Department of Astronomy and Space Science, Chungnam National University, Daejeon, South Korea; Division of Science Education, College of Education, Daegu University, Gyeongsan, South Korea; Korea Astronomy and Space Science Institute, Daejeon, South Korea; Department of Astronomy and Space Science, University of Science and Technology, Daejeon, South Korea; Swedish Institute of Space Physics, Kiruna, Sweden; Tromsø Geophysical Observatory, UiT-The Arctic University of Norway, Tromsø, Norway

Recommended Citation:
Lee Y.-S.,Kim Y.H.,Kim K.-C.,et al. EISCAT Observation of Wave-Like Fluctuations in Vertical Velocity of Polar Mesospheric Summer Echoes Associated With a Geomagnetic Disturbance[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)
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