太阳风阿尔文波湍流 赵金松 紫金山天文台 第四届中国青年论坛 2015年5月20-22日 南京.

Presentation on theme: "太阳风阿尔文波湍流 赵金松 紫金山天文台 第四届中国青年论坛 2015年5月20-22日 南京."— Presentation transcript:

1 太阳风阿尔文波湍流 赵金松 紫金山天文台 第四届中国青年论坛 2015年5月20-22日 南京

2 阿尔文湍流的观测 Bale et al. 2005 He et al. 2012 Sahraoui et al. 2010

3 阿尔文湍流的观测 Huang et al. 2012 Sahraoui et al. 2013 有限频率

4 唯象理论 AW tur. (collisions between Weak tur.
counterpropagating wavepackets) Iroshnikov 1964, Kraichnan 1965 Weak tur. Galtier et al. 2000 Strong tur. (critical balance) Goldreich and Sridhar 1995 KAW tur. e.g., Quataert and Gruzinov 1999, Leamon et al. 1999, Kolmogorov 1941 theory. space filling. intermittency Frisch 1995

5 唯象理论

6 唯象理论 Generation of high frequencies ω/ωci >1 by the turbulent cascade is possible and depends on the injection scale, frequency, and the turbulence state. Large parallel wavenumbers and frequencies are generated faster in the intermittent turbulence than in the space-filling one. A good correspondence of predicted indexes [-7/3,-3] with the measured spectral indexes [-2.5, -3.1] suggest that the solar wind turbulence at kinetic scale is intermittent and consists of varying fractions of sheet-like and tube-like fluctuations.

7 太阳大气反向阿尔文波 In Active Regions Tomczyk & MiIntosh 2009 (
, ~ tens of minutes) Timescale and length-scale for Alfven wave cascading to ion-cyclotron frequency:

8 THANKS