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Nonlinear and linear timescales near kinetic scales in solar wind turbulence
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Matthaeus, W. H., Oughton, S., Osman, K. T., Servidio, S., Wan, M., Gary, S. P., Shay, M. A., Valentini, F., Roytershteyn, V., Karimabadi, H. and Chapman, Sandra C. (2014) Nonlinear and linear timescales near kinetic scales in solar wind turbulence. The Astrophysical Journal, Volume 790 (Number 2). Article number 155. doi:10.1088/0004-637X/790/2/155 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/790/2/155
Abstract
The application of linear kinetic treatments to plasma waves, damping, and instability requires favorable inequalities between the associated linear timescales and timescales for nonlinear (e.g., turbulence) evolution. In the solar wind these two types of timescales may be directly compared using standard Kolmogorov-style analysis and observational data. The estimated local (in scale) nonlinear magnetohydrodynamic cascade times, evaluated as relevant kinetic scales are approached, remain slower than the cyclotron period, but comparable to or faster than the typical timescales of instabilities, anisotropic waves, and wave damping. The variation with length scale of the turbulence timescales is supported by observations and simulations. On this basis the use of linear theory—which assumes constant parameters to calculate the associated kinetic rates—may be questioned. It is suggested that the product of proton gyrofrequency and nonlinear time at the ion gyroscales provides a simple measure of turbulence influence on proton kinetic behavior.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 17 July 2014 | ||||||||
| Dates: |
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| Volume: | Volume 790 | ||||||||
| Number: | Number 2 | ||||||||
| Article Number: | Article number 155 | ||||||||
| DOI: | 10.1088/0004-637X/790/2/155 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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