Magnetic Shear Damped Polar Convective Fluid Instabilities. Issue 1 (15th January 2018)

• Record Type: Journal Article
• Authors: Atul, Jyoti K.; Singh, Rameswar; Sarkar, Sanjib; Kravchenko, Oleg V.; Singh, Sushil K.; Chattopadhyaya, Prabal K.; Kaw, Predhiman K.
• Is Part Of: Journal of geophysical research. Volume 123:Issue 1(2018)
• Page Start: 808
• Page End: 818
• Publication Date: 2018-01-15
• Subjects: convective fluid instabilities -- auroral plasma -- blob dynamics; Magnetospheric physics -- Periodicals; Space environment -- Periodicals; Cosmic physics -- Periodicals; Planets -- Atmospheres -- Periodicals; Heliosphere (Astrophysics) -- Periodicals; Geophysics -- Periodicals; 523.01
• DOI: 10.1002/2017JA024778
• Languages: English
• ISSNs: 2169-9380

Abstract

Abstract: The influence of the magnetic field shear is studied on the E × B (and/or gravitational) and the Current Convective Instabilities (CCI) occurring in the high‐latitude F layer ionosphere. It is shown that magnetic shear reduces the growth rate of these instabilities. The magnetic shear‐induced stabilization is more effective at the larger‐scale sizes (≥ tens of kilometers) while at the scintillation causing intermediate scale sizes (∼ a few kilometers), the growth rate remains largely unaffected. The eigenmode structure gets localized about a rational surface due to finite magnetic shear and has broken reflectional symmetry due to centroid shift of the mode by equilibrium parallel flow or current. Key Points: Magnetic field shear effects on convective fluid plasma instability processes are investigated for high‐latitude F layer ionosphere Gradient drift, gravitational, and current convective instabilities are found to be important The magnetic shear‐induced stabilization is more effective at the larger‐scale sizes as compared to the scintillation causing intermediate scale sizes