Articles | Volume 39, issue 1
https://doi.org/10.5194/angeo-39-165-2021
https://doi.org/10.5194/angeo-39-165-2021
ANGEO Communicates
 | 
22 Feb 2021
ANGEO Communicates |  | 22 Feb 2021

Wavevector spectral signature of decay instability in space plasmas

Horia Comişel, Yasuhito Narita, and Uwe Motschmann

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Short summary
Identification of a large-amplitude Alfvén wave decaying into a pair of ion-acoustic and daughter Alfvén waves is one of the major goals in the observational studies of space plasma nonlinearity. Growth-rate maps may serve as a useful tool for predictions of the wavevector spectrum of density or magnetic field fluctuations in various scenarios for the wave–wave coupling processes developing at different stages in space plasma turbulence.