Please use this identifier to cite or link to this item: http://library.iigm.res.in:8080/xmlui/handle/123456789/254
Title: Role of helicon modes in the injection of oxygen ions in the ring current
Authors: Lakhina, G.S.
Keywords: Helicon modes
Oxygen
Ring current
Ionosphere–magnetosphere coupling
Magnetosphere
Near-Earth plasma sheet region
Issue Date: 2001
Citation: Journal of Atmospheric and Solar-Terrestrial Physics, v.63, p.481-487, 2001, doi: 10.1016/S1364-6826(00)00160-7
Abstract: The presence of an ionospheric-origin anisotropic oxygen ion beam can excite a helicon mode instability in the near-Earth plasma sheet region. The helicon modes can be easily excited under the conditions when the usual long wavelength fire-hose modes are stable. The helicon modes are likely to attain saturation as the typical e-folding time of the instability is about a few minutes in the near-Earth plasma sheet region. Therefore, the instability could significantly affect substorm dynamics and lead to enhanced ionosphere–magnetosphere coupling. Low-frequency turbulence produced by these modes could scatter electrons trapped in the inner central plasma sheer region and help excite the ion tearing modes, leading to substorm onset. As a result, the oxygen ions would be injected into the Earth's nightside magnetosphere. Repeated injections by this process would lead to enhanced oxygen ion fluxes in the storm-time ring current.
URI: http://localhost:8080/xmlui/handle/123456789/254
Appears in Collections:UAS_Reprints

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