Journal article
Zonostrophic instability driven by discrete particle noise
- Abstract:
- The consequences of discrete particle noise for a system possessing a possibly unstable collective mode are discussed. It is argued that a zonostrophic instability (of homogeneous turbulence to the formation of zonal flows) occurs just below the threshold for linear instability. The scenario provides a new interpretation of the random forcing that is ubiquitously invoked in stochastic models such as the second-order cumulant expansion or stochastic structural instability theory; neither intrinsic turbulence nor coupling to extrinsic turbulence is required. A representative calculation of the zonostrophic neutral curve is made for a simple two-field model of toroidal ion-temperature-gradient-driven modes. To the extent that the damping of zonal flows is controlled by the ion-ion collision rate, the point of zonostrophic instability is independent of that rate.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Accepted manuscript, pdf, 351.3KB, Terms of use)
-
- Publisher copy:
- 10.1063/1.4978786
Authors
- Publisher:
- American Institute of Physics
- Journal:
- Physics of Plasma More from this journal
- Volume:
- 24
- Issue:
- 4
- Publication date:
- 2017-04-03
- Acceptance date:
- 2017-03-03
- DOI:
- EISSN:
-
1089-7674
- ISSN:
-
1070-664X
- Keywords:
- Pubs id:
-
pubs:1043320
- UUID:
-
uuid:141c62e4-e394-4c32-a0e1-58bebf01ab3a
- Local pid:
-
pubs:1043320
- Source identifiers:
-
1043320
- Deposit date:
-
2019-09-03
Terms of use
- Copyright holder:
- St Onge and Krommes
- Copyright date:
- 2017
- Notes:
- © 2017 Author(s). This is the accepted manuscript version of the article. The final version can be found from AIP at: https://doi.org/10.1063/1.4978786
If you are the owner of this record, you can report an update to it here: Report update to this record