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The THU-NAOC transient survey: the performance and results from the first year
Zhang, TM; Wang, XF; Chen, JC; Zhang, JJ; Zhou, L; Li, WX; Liu, Q; Mo, J; Zhang, KC; Yao, XY; Zhao, XL; Zhou, X; Nie, JD; Huang, F; Jiang, ZJ; Ma, J; Wang, LZ; Wu, C; Zhou, ZM; Zou, H; Wang, LF
Source PublicationResearch in Astronomy and Astrophysics
AbstractWe 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.
Subject Area天文和天体物理
Indexed BySCI
WOS IDWOS:000348761500006
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Document Type期刊论文
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GB/T 7714
Zhang, TM,Wang, XF,Chen, JC,et al. The THU-NAOC transient survey: the performance and results from the first year[J]. Research in Astronomy and Astrophysics,2015,15(2):215-224.
APA Zhang, TM.,Wang, XF.,Chen, JC.,Zhang, JJ.,Zhou, L.,...&Wang, LF.(2015).The THU-NAOC transient survey: the performance and results from the first year.Research in Astronomy and Astrophysics,15(2),215-224.
MLA Zhang, TM,et al."The THU-NAOC transient survey: the performance and results from the first year".Research in Astronomy and Astrophysics 15.2(2015):215-224.
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