dc.contributor.author |
Lakhina, G.S. |
|
dc.date.accessioned |
2015-08-20T11:25:14Z |
|
dc.date.accessioned |
2021-02-12T10:30:53Z |
|
dc.date.available |
2015-08-20T11:25:14Z |
|
dc.date.available |
2021-02-12T10:30:53Z |
|
dc.date.issued |
2001 |
|
dc.identifier.citation |
Journal of Atmospheric and Solar-Terrestrial Physics, v.63, p.481-487, 2001, doi: 10.1016/S1364-6826(00)00160-7 |
en_US |
dc.identifier.uri |
http://localhost:8080/xmlui/handle/123456789/254 |
|
dc.description.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. |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
Helicon modes |
en_US |
dc.subject |
Oxygen |
en_US |
dc.subject |
Ring current |
en_US |
dc.subject |
Ionosphere–magnetosphere coupling |
en_US |
dc.subject |
Magnetosphere |
en_US |
dc.subject |
Near-Earth plasma sheet region |
en_US |
dc.title |
Role of helicon modes in the injection of oxygen ions in the ring current |
en_US |
dc.type |
Article |
en_US |
dc.identifier.accession |
090741 |
|