In this section
@article{Duan:2021:2041-8213/ac07ac,
author = {Duan, D and He, J and Bowen, TA and Woodham, LD and Wang, T and Chen, CHK and Mallet, A and Bale, SD},
doi = {2041-8213/ac07ac},
journal = {Letters of the Astrophysical Journal},
pages = {1--7},
title = {Anisotropy of solar wind turbulence in the inner heliosphere at kinetic scales: PSP observations},
url = {http://dx.doi.org/10.3847/2041-8213/ac07ac},
volume = {915},
year = {2021}
}
TY - JOUR
AB - The anisotropy of solar wind turbulence is a critical issue in understanding the physics of energy transfer between scales and energy conversion between fields and particles in the heliosphere. Using the measurement of Parker Solar Probe (PSP), we present an observation of the anisotropy at kinetic scales in the slow, Alfvénic, solar wind in the inner heliosphere. The magnetic compressibility behaves as expected for kinetic Alfvénic turbulence below the ion scale. A steepened transition range is found between the inertial and kinetic ranges in all directions with respect to the local background magnetic field direction. The anisotropy of k⊥ k is found evident in both transition and kinetic ranges, with the power anisotropy P⊥/P > 10 in the kinetic range leading over that in the transition range and being stronger than that at 1 au. The spectral index varies from αt = −5.7 ± 1.0 to αt⊥ = −3.7 ± 0.3 in the transition range and αk = −3.12 ± 0.22 to αk⊥ = −2.57 ± 0.09 in the kinetic range. The corresponding wavevector anisotropy has the scaling of ${k}_{\parallel }\sim {k}_{\perp }^{0.71\pm 0.17}$ in the transition range, and changes to ${k}_{\parallel }\sim {k}_{\perp }^{0.38\pm 0.09}$ in the kinetic range, consistent with the kinetic Alfvénic turbulence at sub-ion scales.
AU - Duan,D
AU - He,J
AU - Bowen,TA
AU - Woodham,LD
AU - Wang,T
AU - Chen,CHK
AU - Mallet,A
AU - Bale,SD
DO - 2041-8213/ac07ac
EP - 7
PY - 2021///
SN - 2041-8205
SP - 1
TI - Anisotropy of solar wind turbulence in the inner heliosphere at kinetic scales: PSP observations
T2 - Letters of the Astrophysical Journal
UR - http://dx.doi.org/10.3847/2041-8213/ac07ac
UR - https://iopscience.iop.org/article/10.3847/2041-8213/ac07ac
UR - http://hdl.handle.net/10044/1/98960
VL - 915
ER -