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PHYSICAL ROLES OF INTERSTELLAR-ORIGIN PICKUP IONS AT THE HELIOSPHERIC TERMINATION SHOCK: IMPACT ON THE SHOCK FRONT MICROSTRUCTURES AND NONSTATIONARITY
Lembege, Bertrand; Yang, Zhongwei; Lembege, B (reprint author), CNRS, UVSQ, IPSL, LATMOS, F-78280 Guyancourt, France.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2016
Volume827Issue:1Pages:73
ISSN0004-637X
Language英语
KeywordAcceleration Of Particles Plasmas Shock Waves Sun: Heliosphere
AbstractThe nonstationary dynamics of the heliospheric termination shock in the presence of pickup ions (PUI) is analyzed by using a one-dimensional particle-in-cell simulation code. This work initially stimulated by Voyager 2 data focusses on this nonstationarity for different percentages of PUIs and for different Alfven Mach numbers M-A. Solar wind ions (SWIs) and PUIs are described, respectively, as Maxwellian and shell distributions (with a zero/finite thickness). For a moderate M-A, present results show that. (1) the shock front is still nonstationary even in the presence of 25% of PUIs; its instantaneous velocity varies, which is in favor for shock multicrossing; (2) the presence of PUIs tends to smooth out the time fluctuations of field. amplitude and of microstructure. widths at the front and overshoot; (3) the shock has a multiple overshoot, which is analyzed by identifying the contributions of SWIs and the PUIs; (4) as the PUI percentage increases, the shock moves faster and the downstream compression becomes weaker, which is explained by a Rankine-Hugoniot model; (5) the reflection rate of SWIs and PUIs decreases as the PUI percentage increases; (6) the shock structure is almost insensitive to the shell thickness;. and (7) for the PUIs dominated shock case (PUI = 55%), the shock becomes stationary. However, for higher M-A regime, the front nonstationarity persists even in the PUI. =. 55% case. In summary, high M-A regime allows to compensate the smoothing of the microstructures and the time fluctuations of the shock front brought by the presence of PUIs.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5679
Collection空间科学部
Corresponding AuthorLembege, B (reprint author), CNRS, UVSQ, IPSL, LATMOS, F-78280 Guyancourt, France.
Recommended Citation
GB/T 7714
Lembege, Bertrand,Yang, Zhongwei,Lembege, B . PHYSICAL ROLES OF INTERSTELLAR-ORIGIN PICKUP IONS AT THE HELIOSPHERIC TERMINATION SHOCK: IMPACT ON THE SHOCK FRONT MICROSTRUCTURES AND NONSTATIONARITY[J]. ASTROPHYSICAL JOURNAL,2016,827(1):73.
APA Lembege, Bertrand,Yang, Zhongwei,&Lembege, B .(2016).PHYSICAL ROLES OF INTERSTELLAR-ORIGIN PICKUP IONS AT THE HELIOSPHERIC TERMINATION SHOCK: IMPACT ON THE SHOCK FRONT MICROSTRUCTURES AND NONSTATIONARITY.ASTROPHYSICAL JOURNAL,827(1),73.
MLA Lembege, Bertrand,et al."PHYSICAL ROLES OF INTERSTELLAR-ORIGIN PICKUP IONS AT THE HELIOSPHERIC TERMINATION SHOCK: IMPACT ON THE SHOCK FRONT MICROSTRUCTURES AND NONSTATIONARITY".ASTROPHYSICAL JOURNAL 827.1(2016):73.
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