Turbulent loss of ring current protons

Cornwall, John M.; Coroniti, F. V.; Thorne, R. M.

doi:10.1029/ja075i025p04699

Cited by 511 publications

(409 citation statements)

References 31 publications

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“…Whether ion cyclotron resonance interactions contribute significantly to this initial rapid decay, as theoreticai work on this inechanism has suggested, (Cornwall, et al, 1970) has not as yet been demonstrated, although some observations of ion cyclotron waves measured by Explorer 45 during magnetic storms have been reported QT ylor, , et al, 1975). !n the second slower decay phase, as we have shown in this pager, charge exchange appears as the dominant decay mechanism for the nearequatorially mirroring protons.…”

Section: Decay Mechanismmentioning

confidence: 99%

Ring current proton decay by charge exchange

Smith

Hoffman

Fritz³

1976

J. Geophys. Res.

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Explorer 45 (S 3 -A) measurements during the recover y phase (,f a moderate magnet;; storm have confirmed that the char g e exchange decay mechanism can account f or the decay of the storm-time proton ring current. The moderate mannetic storm of 24 February 1972 was selected for study since a svi mccric ring current hr , developed and effects due to asymmetric rin g current losses ^o!-a eliminated.In this study it was found that after the initial rapid deca y of the p roton flux, which is a consequence of the dissipation of the asymmetric ring current, the equatorially mirroring protons in the energy range 5-30 keV decayed throu q hout the L-value ran g e of 3.5 to 5.0 at the r '-arge exchange decay rate calculated by Liemohn (1961).After several days of decay, the proton fluxes reached a lower limit where an ap p arent equilibrium was maintained, between weak particle source mechanisms and the loss mechanisms, until fresh protons were injected into the rinq curr-nt renion durin q substorms. blhile other proton loss mechanisms may also be operating, the results indicate that charge exchange can entirely account for the storm-time proton ring current decay, and that this mechanism must be considered in all studies involving the loss of proton rinq current particles.

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Section: Decay Mechanismmentioning

confidence: 99%

Ring current proton decay by charge exchange

Smith

Hoffman

Fritz³

1976

J. Geophys. Res.

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“…The equatorial mapping of the detached arc to the plasmaspheric drainage plume is suggestive of a mechanism involving the interaction of hot ring current ions with cold plasmaspheric material. This is an environment suitable for the amplification of EMIC waves as first predicted by Cornwall et al [1970] and subsequently investigated by many others [e.g., Anderson et al, 1992;Gary et al, 1995]. Scattering by EMIC waves will lead to the precipitation of ring current protons and the excitation of subauroral arcs Spasojevic et al, 2004].…”

Section: Introductionmentioning

confidence: 99%

Modeling the electromagnetic ion cyclotron wave‐induced formation of detached subauroral proton arcs

2007

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[1] Detached dayside proton arcs have been recently observed at Earth with the IMAGE FUV instrument as subauroral arcs separated from the main oval and extending over several hours of local time in the afternoon sector. We investigate the mechanisms causing the proton precipitation during two subauroral arc events that occurred on 23 January 2001 and 18 June 2001. We employ our kinetic physics-based model coupled with a dynamic plasmasphere model and calculate the growth rate of electromagnetic ion cyclotron (EMIC) waves self-consistently with the evolving ring current H + , O + , and He + ion distributions. Modeled plasmaspheric densities agree well with in situ observations from geosynchronous LANL satellites and duskside plasmapause observations from IMAGE EUV but overestimate the drainage plume extent toward noon on 18 June. Global images of precipitating H + ions are obtained and compared with IMAGE observations of proton arcs. We find that EMIC waves are preferentially excited, and proton precipitation maximizes, within regions of spatial overlap of energetic ring current protons and dayside plasmaspheric plumes and along steep density gradients at the plasmapause. The model matches very well the temporal and spatial evolution of FUV observations on 23 January. The predicted location of the proton precipitation on 18 June extends a few hours westward of the observations, and an offset of 2 hours in the convection electric field is needed to reproduce well the evolution of the proton arc. This study indicates that cyclotron resonant wave-particle interactions are a viable mechanism for the generation of subauroral proton arcs.Citation: Jordanova, V. K., M. Spasojevic, and M. F. Thomsen (2007), Modeling the electromagnetic ion cyclotron wave-induced formation of detached subauroral proton arcs,

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“…E-t spectrograms of electron and proton intensities encountered for a 48-hour period are presented in Figure 16. The pitch angles sampled in this and plasma sheet and thus also in their precipitation into the auroral zone [Cornwall et al, 1970]. …”

Section: The Magnetospheric Plasmasmentioning

confidence: 99%

Magnetospheric and auroral plasmas: A short survey of progress

Frank¹

1975

Reviews of Geophysics

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Important milestones in our researches of auroral and magnetospheric plasmas for the past quadrennium 1971–1975 are reviewed. Many exciting findings, including those of the polar cusp, the polar wind, the explosive disruptions of the magnetotail, the interactions of hot plasmas with the plasmapause, the auroral field‐aligned currents, and the striking inverted V electron precipitation events, were reported during this period. Solutions to major questions concerning the origins and acceleration of these plasmas appear possible in the near future. A comprehensive bibliography of current research is appended to this brief survey of auroral and magnetospheric plasmas.

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Turbulent loss of ring current protons

Cited by 511 publications

References 31 publications

Ring current proton decay by charge exchange

Ring current proton decay by charge exchange

Modeling the electromagnetic ion cyclotron wave‐induced formation of detached subauroral proton arcs

Magnetospheric and auroral plasmas: A short survey of progress

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