Abstract
Abstract A statistical study of the THEMIS FGM and ESA data is performed on turbulence of magnetic field and velocity for 218 selected 12 min intervals in BBFs. The spectral index α in the frequency range of 0.005–0.06 Hz are Gaussian distributions. The peaks indexes of total ion velocity V i and parallel velocity V ‖ are 1.95 and 2.07 nearly the spectral index of intermittent low frequency turbulence with large amplitude. However, most probable α of perpendicular velocity V ⊥ is about 1.75. It is a little bigger than 5/3 of Kolmogorov (1941). The peak indexes of total magnetic field B T is 1.70 similar to V ⊥ . Compression magnetic field B ‖ are 1.85 which is smaller than 2 and bigger than 5/3 of Kolmogorov (1941). The most probable spectral index of shear B ⊥ is about 1.44 which is close to 3/2 of Kraichnan (1965). Max V ⊥ have little effect on the power magnitude of V T and V ‖ but is positively correlated to spectral index of V ⊥ . The spectral power of B T , B ‖ and B ⊥ increase with max perpendicular velocity but spectral indexes of them are negatively correlated to V ⊥ . The spectral index and the spectral power of magnetic field over the frequency interval 0.005–0.06 Hz is very different from that over 0.08–1 Hz.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call