Sufficient conditions of Rayleigh-Taylor stability and instability in equatorial ionosphere

Sicheng, Wang; Huang, Shucai

doi:10.1007/s10483-016-2022-8

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…Unseasonal events are categorized as EPB events during the non‐bubble season, such as solstices in the South East Asia region during solar minimum, or non‐bubble days during bubble season (e.g., December solstice in South America). There are two factors controlling the overall growth of EPBs; the magnitude of the RT growth rate (e.g., Carter et al., 2014; Rajesh et al., 2017; Sultan, 1996; Wang & Huang, 2016) and the presence/amplitude of an initial seed perturbation (e.g., Retterer & Roddy, 2014; Tsunoda, 2010b). Retterer and Roddy (2014) investigated the role of the seed amplitude and the upward plasma drift through simulations in the PBMOD model.…”

Section: Introductionmentioning

confidence: 99%

On the Generation of an Unseasonal EPB Over South East Asia

et al. 2021

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An unseasonal equatorial plasma bubble (EPB) event over South‐East Asia was observed on July 22, 2014 that has not been studied before. An investigation into this event is presented with the 26th July, 2014 as a comparison, non‐bubble day. The 22nd July EPB event occurred in the late post‐sunset sector and was associated with a small upward plasma drift. This event was highlighted using a new filter on the SCINDA S4 data. Ionosonde data show that sporadic E was present during the growth period for the EPB event. Modeling results from Thermosphere‐Ionosphere Electrodynamics (TEC) Global Circulation Model were used to conduct a numerical experiment investigating the direct effect of sporadic E on the linear R‐T growth rate. It was shown that sporadic E located in the correct latitude and local time can increase the linear growth rate. The seeding conditions were investigated using TEC data from Patumwan, Thailand. Wave‐like structures were observed for both days of interest, with larger amplitudes on 22nd July compared with the 26th July. Finally, simulations using the high‐resolution model PBMOD showed that for forcing from above conditions similar to the days of interest, EPBs would form in the presence of large seed perturbations. Therefore, it is likely that this unseasonal event was caused by large seed perturbations in TEC.

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Section: Introductionmentioning

confidence: 99%

On the Generation of an Unseasonal EPB Over South East Asia

et al. 2021

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“…[7] Oliver and Ulrich [8] discussed the linear stability of compressible flow, and solved the eigenvalue problem of linear stability theory for three different cases. Wang and Huang [9] used the variational method to deduce the sufficient conditions of linear stability and instability when studying ionospheric variations in equatorial and low latitude areas.…”

Section: Introductionmentioning

confidence: 99%

Establishment of infinite dimensional Hamiltonian system of multilayer quasi-geostrophic flow & study on its linear stability

Huang¹,

Wang²,

Xiang³

2017

Chinese Phys. B

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A multilayer flow is a stratified fluid composed of a finite number of layers with densities homogeneous within one layer but different from each other. It is an intermediate system between the single-layer barotropic model and the continuously stratified baroclinic model. Since this system can simulate the baroclinic effect simply, it is widely used to study the large-scale dynamic process in atmosphere and ocean. The present paper is concerned with the linear stability of the multilayer quasi-geostrophic flow, and the associated linear stability criteria are established. Firstly, the nonlinear model is turned into the form of a Hamiltonian system, and a basic flow is defined. But it cannot be an extreme point of the Hamiltonian function since the system is an infinite-dimensional one. Therefore, it is necessary to reconstruct a new Hamiltonian function so that the basic flow becomes an extreme point of it. Secondly, the linearized equations of disturbances in the multilayer quasi-geostrophic flow are derived by introducing infinitesimal disturbances superposed on the basic flows. Finally, the properties of the linearized system are discussed, and the linear stability criteria in the sense of Liapunov are derived under two different conditions with respect to certain norms.

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