In this section
@article{Opie:2024:10.1017/S0022377824001375,
author = {Opie, S and Verscharen, D and Chen, CHK and Owen, CJ and Isenberg, PA and Sorriso-Valvo, L and Franci, L and Matteini, L},
doi = {10.1017/S0022377824001375},
journal = {Journal of Plasma Physics},
title = {Temperature anisotropy instabilities driven by intermittent velocity shears in the solar wind},
url = {http://dx.doi.org/10.1017/S0022377824001375},
volume = {90},
year = {2024}
}
TY - JOUR
AB - Where and under what conditions the transfer of energy between electromagnetic fields and particles takes place in the solar wind remains an open question. We investigate the conditions that promote the growth of kinetic instabilities predicted by linear theory to infer how turbulence and temperature-anisotropy-driven instabilities are interrelated. Using a large dataset from Solar Orbiter, we introduce the radial rate of strain, a novel measure computed from single-spacecraft data, which we interpret as a proxy for the double-adiabatic strain rate. The solar wind exhibits high absolute values of the radial rate of strain at locations with large temperature anisotropy. We measure the kurtosis and skewness of the radial rate of strain from the statistical moments to show that it is non-Gaussian for unstable intervals and increasingly intermittent at smaller scales with a power-law scaling. We conclude that the velocity field fluctuations in the solar wind contribute to the presence of temperature anisotropy sufficient to create potentially unstable conditions.
AU - Opie,S
AU - Verscharen,D
AU - Chen,CHK
AU - Owen,CJ
AU - Isenberg,PA
AU - Sorriso-Valvo,L
AU - Franci,L
AU - Matteini,L
DO - 10.1017/S0022377824001375
PY - 2024///
SN - 0022-3778
TI - Temperature anisotropy instabilities driven by intermittent velocity shears in the solar wind
T2 - Journal of Plasma Physics
UR - http://dx.doi.org/10.1017/S0022377824001375
VL - 90
ER -