Nearly constant ratio between the proton inertial scale and the spectrum break length scale in the plasma beta range from 0.2 to 1.4 in the solar wind turbulence

Xin Wang1, Chuan-Yi Tu2, Jiansen He2 and Linghua Wang3, (1)Beihang University, School of Space Science and Environment, Beijing, China, (2)Peking University, Beijing, China, (3)Peking University, Institute of Space Physics and Applied Technology, Beijing, China