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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 |
Files in This Item:
File | Description | Size | Format | |
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Lakhina,JASTP_2001_481-487.pdf Restricted Access | 120.52 kB | Adobe PDF | View/Open Request a copy |
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