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Multi-scale Driving of Turbulence and Astrophysical Implications
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  • Multi-scale Driving of Turbulence and Astrophysical Implications
  • Multi-scale Driving of Turbulence and Astrophysical Implications
저자명
Yoo. Hyunju,Cho. Jungyeon
간행물명
천문학회보
권/호정보
2013년|38권 2호|pp.61-61 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Turbulence is a common phenomenon in astrophysical fluids such as the interstellar medium (ISM) and the intracluster medium (ICM). In turbulence studies it is customary to assume that fluid powered by an energy injection on a single scale. However, in astrophysical fluids, there can be many different driving mechanisms that act on different scales simultaneously. In this work, we assume multiple energy injection scale (2<k< ${surd}$12 and 15<k<26 in Fourier space) and perform 3-dimensional incompressible/compressible magnetohydrodynamic (MHD) turbulence simulations. First, we briefly show result on statistical properties of our simulations. We show how kinetic, magnetic and density spectra are affected by the two-scale energy injection rates and discuss observational implications such as column density, rotation measure, and velocity centroids. We discuss turbulence dynamo and turbulence transport quantities such as field-line divergence and turbulence diffusion in the presence of energy injections at two scales. When large-scale energy injection rate is smaller than small-scale one, our results show that even a tiny amount of large-scale energy injection can significantly change the properties of turbulence. On the other hand, when large-scale energy injection rate is larger than small-scale one, the small-scale driving does not influence turbulence statistics much.