@article{Del:2015:10.1017/s0022377814000579,
author = {Del, Zanna L and Matteini, L and Landi, S and Verdini, A and Velli, M},
doi = {10.1017/s0022377814000579},
journal = {Journal of Plasma Physics},
title = {Parametric decay of parallel and oblique Alfvén waves in the expanding solar wind},
url = {http://dx.doi.org/10.1017/s0022377814000579},
volume = {81},
year = {2015}
}

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TY  - JOUR
AB  - <jats:p>The long-term evolution of large-amplitude Alfvén waves propagating in the solar wind is investigated by performing two-dimensional MHD simulations within the expanding box model. The linear and nonlinear phases of the parametric decay instability are studied for both circularly polarized waves in parallel propagation and for arc-polarized waves in oblique propagation. The non-monochromatic case is also considered. In the oblique case, the direct excitation of daughter modes transverse to the local background field is found for the first time in an expanding environment, and this transverse cascade seems to be favored for monochromatic mother waves. The expansion effect reduces the instability growth rate, and it can even suppress its onset for the lowest frequency modes considered here, possibly explaining the persistence of these outgoing waves in the solar wind.</jats:p>
AU  - Del,Zanna L
AU  - Matteini,L
AU  - Landi,S
AU  - Verdini,A
AU  - Velli,M
DO  - 10.1017/s0022377814000579
PY  - 2015///
SN  - 0022-3778
TI  - Parametric decay of parallel and oblique Alfvén waves in the expanding solar wind
T2  - Journal of Plasma Physics
UR  - http://dx.doi.org/10.1017/s0022377814000579
VL  - 81
ER  - 

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