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题名: The THU-NAOC transient survey: the performance and results from the first year
作者: Zhang, TM ; Wang, XF ; Chen, JC ; Zhang, JJ ; Zhou, L ; Li, WX ; Liu, Q ; Mo, J ; Zhang, KC ; Yao, XY ; Zhao, XL ; Zhou Xin(周鑫) ; Nie, JD ; Huang, F ; Jiang, ZJ ; Ma, J ; Wang, LZ ; Wu, C ; Zhou, ZM ; Zou, H ; Wang LiFan(王力帆)
刊名: Research in Astronomy and Astrophysics
出版日期: 2015
卷号: 15, 期号:2, 页码:215-224
学科分类: 天文和天体物理
文章类型: 期刊论文
英文摘要: We found several efficient nonlinear decays for Alfven waves in the solar wind conditions. Depending on the wavelength, the dominant decay is controlled by the nonlinearities proportional to either scalar or vector products of wavevectors. The two-mode decays of the pump MHD Alfven wave into co- and counter-propagating product Alfven and slow waves are controlled by the scalar nonlinearities at long wavelengths rho(2)(i)k(0 perpendicular to)(2) < omega(0)/omega(ci) (k(0 perpendicular to) is wavenumber perpendicular to the background magnetic field, omega(0) is frequency of the pump Alfven wave, rho(i) is ion gyroradius, and omega(ci) is ion-cyclotron frequency). The scalar decays exhibit both local and nonlocal properties and can generate not only MHD-scale but also kinetic-scale Alfven and slow waves, which can strongly accelerate spectral transport. All waves in the scalar decays propagate in the same plane, hence these decays are two-dimensional. At shorter wavelengths, rho(2)(i)k(0 perpendicular to)(2) > omega(0)/omega(ci), three-dimensional vector decays dominate generating out-of-plane product waves. The two-mode decays dominate from MHD up to ion scales rho(i)k(0 perpendicular to) similar or equal to 0.3; at shorter scales the one-mode vector decays become stronger and generate only Alfven product waves. In the solar wind the two-mode decays have high growth rates > 0.1 omega(0) and can explain the origin of slow waves observed at kinetic scales.
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000348761500006
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14895
Appears in Collections:南极天文中心_期刊论文

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