globalchange  > 气候减缓与适应
DOI: 10.1002/2014GL061493
论文题名:
Effects of magnetic field configuration on the day-night asymmetry of chorus occurrence rate: A numerical study
作者: Tao X.; Lu Q.; Wang S.; Dai L.
刊名: Geophysical Research Letters
ISSN: 0094-9748
EISSN: 1944-9479
出版年: 2014
卷: 41, 期:19
起始页码: 6577
结束页码: 6582
语种: 英语
英文关键词: day-night asymmetry ; dayside chorus ; magnetic field inhomogeneity
Scopus关键词: Electromagnetic waves ; Excited states ; Hot electrons ; Magnetic fields ; Magnetism ; day-night asymmetry ; dayside chorus ; Electron distributions ; Magnetic field configurations ; Magnetic field inhomogeneities ; Numerical experiments ; Temperature anisotropy ; Uniform magnetic fields ; Magnetic field effects ; homogeneity ; magnetic field ; radio wave ; wave propagation
英文摘要: Effects of magnetic field configuration on the day-night asymmetry of chorus occurrence rate are investigated using a recently developed hybrid code. Previous observational studies show that dayside chorus occurs in regions where the background magnetic field is nearly homogeneous; these observations suggest that the magnetic field configuration might play a significant role in the dayside chorus excitation. In this work, we use a hybrid code to numerically study the threshold conditions of hot electron distributions required to excite chorus waves for different background magnetic field inhomogeneities. Our numerical experiments demonstrate that in a magnetic field with smaller inhomogeneity, smaller temperature anisotropy and smaller number density of hot electrons are needed to excite chorus waves. This conclusion could help explain the higher occurrence rate of chorus waves on the dayside compared with that on the nightside especially in quiet times. Key PointsThe nearly uniform magnetic field is important to the dayside chorus excitationA small magnetic field inhomogeneity lowers the threshold free energy ©2014. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911164691&doi=10.1002%2f2014GL061493&partnerID=40&md5=61fd2bdc57aeead1da2fa9bb723630af
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7012
Appears in Collections:气候减缓与适应

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作者单位: CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science Technology of China, Anhui, Hefei, China

Recommended Citation:
Tao X.,Lu Q.,Wang S.,et al. Effects of magnetic field configuration on the day-night asymmetry of chorus occurrence rate: A numerical study[J]. Geophysical Research Letters,2014-01-01,41(19).
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