Anharmonic oscillatory flow braking in the Earth's magnetotail

被引:12
|
作者
Panov, E. V. [1 ]
Wolf, R. A. [2 ]
Kubyshkina, M. V. [3 ]
Nakamura, R. [1 ]
Baumjohann, W. [1 ]
机构
[1] Austrian Acad Sci, Space Res Inst, A-8010 Graz, Austria
[2] Rice Univ, Phys & Astron Dept, Houston, TX USA
[3] St Petersburg State Univ, Inst Phys, St Petersburg 199034, Russia
基金
奥地利科学基金会;
关键词
plasma sheet; oscillatory flow braking; anharmonic oscillation; substorm; reconnection; BBF; SUBSTORM CURRENT WEDGE; PLASMA SHEET; PI2; PULSATIONS; DIPOLARIZATION; MAGNETOSPHERE; MAGNETOMETER; CONVECTION; TRANSPORT; PERIOD; ARRAY;
D O I
10.1002/2015GL064057
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Plasma sheet bursty bulk flows often oscillate around their equilibrium position at about 10R(E) downtail. The radial magnetic field, pressure, and flux tube volume profiles usually behave differently earthward and tailward of this position. Using data from five Time History of Events and Macroscale Interactions during Substorms (THEMIS) probes, we reconstruct these profiles with the help of an empirical model and apply thin filament theory to show that the oscillatory flow braking can occur in an asymmetric potential. Thus, the thin filament oscillations appear to be anharmonic, with a power spectrum exhibiting peaks at both the fundamental frequency and the first harmonic. Such anharmonic oscillatory braking can explain the presence of the first harmonic in Pi2 pulsations (frequency doubling), which are simultaneously observed by magnetometers on the ground near the conjugate THEMIS footprints.
引用
收藏
页码:3700 / 3706
页数:7
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