Direct and indirect charged aerodynamic mechanisms in the ionosphere

Capon, Christopher; Brown, Melrose; Boyce, Russell

doi:10.1016/j.asr.2018.06.007

Cited by 10 publications

(6 citation statements)

References 47 publications

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“…Hu and Wang [7,8] have analyzed the large objects in a collisionless and mesothermal plasma flow. Capon et al [9] studied the direct and indirect charged aerodynamic mechanism of the low earth orbit objects in the ionosphere. Albarran and Barjatya [10] have made plasma density analysis of CubeSat wakes in the ionosphere, and revealed that there have density depletion in their wake.…”

Section: Introductionmentioning

confidence: 99%

The feature of the wake-plasma of a space vehicle induced by modulational instability

Wang¹,

Yang²,

Chen³

et al. 2021

Phys. Scr.

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The characteristics of modulation instability in the wake plasma of space vehicle are obtained, based on the nonlinear coupling equations of the wake plasma and space vehicle in non-steady-state and non-static limit. It is found that the modulation instability is strongly related to the disturbance angle. The growth rate of transverse modulation instability is always much greater than that of longitudinal ones. Then the characteristic scale of the localized fields and density cavitons in the wake plasma of space vehicle are mainly determined by the transverse modulation instability. The growth rate of modulation instability increasing with the ponderomotive force of pump wave field, but the characteristic scale decreasing with it. Furthermore, the growth rate of modulation instability has maximum value on the central axis of space vehicle in the wake plasma, and the value increasing with the speed of space vehicle. The present results can provide a more detailed theoretical reference for the detection of space vehicle in ionospheric and stealth aircraft in plasma environments.

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Section: Introductionmentioning

confidence: 99%

The feature of the wake-plasma of a space vehicle induced by modulational instability

Wang¹,

Yang²,

Chen³

et al. 2021

Phys. Scr.

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“…• Use of O+ and H+ allow direct comparisons to the flows analysed in Capon et al [27], as these are all single species H+ or O+ flows.…”

Section: Research Questions and Aimmentioning

confidence: 99%

“…In Capon et al [27], a response surface is developed to find drag as a function of α k and χ. While this response surface is only designed for single species flows, it provides a physics based function to equate wake features to drag coefficients, and therefore an important basis for study of mixed flows.…”

Section: Ionospheric Aerodynamics Response Surfacementioning

confidence: 99%

“…The most prominent limitation of the study performed in [27] when applied to mixed flows lies in the use of the α k parameter in the response surface. While this study was carried out entirely on single species flows, the χ parameter is independent of number of species, while α k refers to only one species at any given time.…”

Section: A: Multi-species Deflection Parametermentioning

confidence: 99%

“…Flows simulated for the empirical response surface developed in [27] were exclusively single species, and the resulting conclusions rely on the assumptions that a section of an orbits path is either dominated by a single species of plasma (usually H+ or O+), or that the behaviour of the mixed flow is consistent with that of a single species of ion. Neutral species behaviour at these altitudes is assumed to still behave according to the cannonball assumption(modelled as a simple flow with a drag coefficient of 2.2).…”

Section: Introductionmentioning

confidence: 99%

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Mixed flow ionospheric aerodynamics

Watson¹

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The increasingly congested near earth environment requires accurate or-bital modelling to prevent collision events that threaten access to spaceinfrastructure. Ionospheric aerodynamics are the largest non-conservativesource of orbital perturbations. Work done by Capon et al provideda prediction method for drag forces on charged bodies in low earth orbitbased on applying approximations of single species flows to representa-tive plasma simulations. Recent work on mixed species plasma sheaths[2][3] motivates investigation of this assumption. Mixed species plasma flows over charged bodies with representative LEOconditions were simulated, focusing on orbital motion limited O+ dom-inated flows, and sheath limited H+ dominated flows. The significanceof small concentrations of different ion species was analysed in terms ofaerodynamic effects on the body. Introduction of small concentrations ofH+ into a flow dominated by O+ molecules showed significant disrup-tions to the wake structure, coupled with an increase in drag coefficientfor a satellite in that flow. Introducing heavier O+ molecules into a sheathdominated H+ flow found little disruption to the wake structure. A multi-species drag model was proposed, building on work in. Thismodel was found to qualitatively describe changes in wake structure, butconsistently over predicted drag coefficients. This finding suggests thatthe influence of mixed species flows on ionospheric aerodynamics involvessignificant contributions from inter-species interactions not described ad-equately by considering the separate species as either separate flows, orone flow with adjusted parameters.

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