Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63..481l&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 5, p. 481-487.
Physics
1
Scientific paper
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.
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