Finite Temperature and Ion Inertia Induced multiple convective fluid instabilities in Polar Patches
Abstract
Simultaneous existence of multiple instabilities has been reported in polar patches [1-4]. The interplay between these participating modes and the associated wave particle interactions are significantly influenced by dominant drivers as well as free energy sources/sinks in these highly dense plasma patches. The relative suppression mechanism and hierarchy of these instabilities needs to be critically investigated with respect to global plasma convection scenario. It turns out that ion/electron temperature characteristics of polar patches further complicates the classical and hot patches transport and its associated energy dynamics [3]. In context with it, the collective influence of finite temperature and ion inertial effect is investigated for the EXB (and/or gravitational) and the current convective instabilities (CCI) to visualize local and global plasma flow convection patterns for these polar patches in sheared magnetic field configuration. Further, global mix-mode potential eigen-mode structure suggests mode localization off the rational surface due to equilibrium parallel dynamics.The characteristic feature of magnetic shear induced large scale stabilization has been extended to include finite temperature and ion inertial effects to probe smaller scale (finite larmor radius) scintillation window[3-4].
References- [1] Atul, J. K., Singh, R., Sarkar, S.,Kravchenko, O. V., Singh, S. K., Chattopadhyaya, P. K., & Kaw, P. K. (2018). Magnetic shear damped polar convective fluid instabilities. Journal of Geophysical Research: Space Physics, 123, 808-818. [2] Gondarenko, N. A., & Guzdar, P. N. (2006). Nonlinear three dimensional simulations of mesoscale structuring by multiple drives in high latitude plasma patches. Journal of Geophysical Research: Space Physics, 111(A8). [3] Ma, Y.-Z., Q.-H. Zhang, Z.-Y. Xing, R. A. Heelis, K. Oksavik, and Y. Wang (2018), The ion/electron temperature characteristics of polar cap classical and hot patches and their influence on ion upflow, Geophysical Research Letters, 45 (16), 8072-8080. [4] Burston, R., C. Mitchell, and I. Astin (2016), Polar cap plasma patch primary linear instability growth rates compared, Journal of Geophysical Research: Space Physics, 121 (4),455 3439-3451.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMSA0310007A
- Keywords:
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- 2431 Ionosphere/magnetosphere interactions;
- IONOSPHERE;
- 2435 Ionospheric disturbances;
- IONOSPHERE;
- 2439 Ionospheric irregularities;
- IONOSPHERE;
- 2447 Modeling and forecasting;
- IONOSPHERE