Acceleration and transport of ions in turbulent current sheets: formation of non-maxwelian energy distribution

Artemyev, А. V.; Zelenyǐ, L. M.; Malova, H. V.; Zimbardo, G.; Delcourt, Dominique

doi:10.5194/npg-16-631-2009

Cited by 29 publications

(25 citation statements)

References 69 publications

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“…Thus, the waves may play some roles in the time evolution of the DFs. The ion fluxes enhancements around DFs may be caused by the low wave activities with a frequency comparable to the local ion cyclotron frequency (Artemyev et al, 2009;Nosé et al, 2010;Ono et al, 2009). We also observed quasi-parallel whistler waves before, during and after the DFs.…”

Section: Wave Analysismentioning

confidence: 54%

Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

et al. 2012

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Abstract. Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfvén ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.

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Section: Wave Analysismentioning

confidence: 54%

Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

et al. 2012

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“…Moreover all beams of this type are characterized by velocity distribution functions rather wide in parallel energies: V D /V T ≥ 1 (contrary to Type-I beams which have V D /V T 1 and energies below the typical value of the potential drop across the tail). Artemyev et al (2009) demonstrated that electromagnetic turbulence could play a role in the process of particle izotropization in the CS, as well as in their acceleration by any inductive electric fields. Therefore Type-II ion beams formation could also be described by a model of particle interaction with the turbulent electromagnetic fields near the X-line.…”

Section: Modeling Of the Formation Of Type-ii Ion Distribution Functimentioning

confidence: 98%

“…Magnetic turbulence developing in the vicinity of the magnetic reconnection region could also become a source of inductive electric fields. Its role in ion acceleration was discussed in detail by Milovanov and Zelenyi (2001) and Artemyev et al (2009). Finally, large electrostatic oscillations arising near the reconnection region could also contribute to the acceleration of non-adiabatic particles (Hoshino et al 2000).…”

Section: Brief Introduction To Ion Non-adiabatic Acceleration In the mentioning

confidence: 97%

Non-adiabatic Ion Acceleration in the Earth Magnetotail and Its Various Manifestations in the Plasma Sheet Boundary Layer

et al. 2011

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Many physical phenomena in space involve energy dissipation which generally leads to charged particle acceleration, often up to very high energies. In the Earth magnetosphere energy accumulation and release occur in the magnetotail, namely in its Current Sheet (CS). The kinetic analysis of non-adiabatic ion trajectories in the CS region with finite but positive normal component of the magnetic field demonstrated that this region is essentially non-uniform in terms of scattering characteristics of ion orbits and contains spatially localized, well-separated sites of enhanced and reduced chaotization. The latter represent sources from which accelerated and energy-collimated ions are ejected into Plasma Sheet 134 E.E. Grigorenko et al.Boundary Layer (PSBL) and stream towards the Earth. Numerical simulations performed as part of a Large-Scale Kinetic Model have shown the multiplet ion structure of the PSBL is formed by a set of ion beams (beamlets) localized both in physical and velocity space. This structure of the PSBL is quite different from the one produced by CS acceleration near a magnetic reconnection region in which more energetic ion beams are generated with a broad range of parallel velocities. Multi-point Cluster observations in the magnetotail PSBL not only showed that non-adiabatic ion acceleration occurs on closed magnetic field lines with at least two CS sources operating simultaneously, but also allowed an estimation of their spatial and temporal characteristics. In this paper we discuss and compare the PSBL manifestations of both mechanisms of CS particle acceleration: one based on the peculiar properties of non-adiabatic ion trajectories which operates on closed magnetic field lines and the other representing the well-explored mechanism of particle acceleration during the course of magnetic reconnection. We show that these two mechanisms supplement each other and the first operates mostly during quiescent magnetotail periods.

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“…According to the numerical modeling, ion interaction with such a turbulent field should result in the particle acceleration in the vicinity of the neutral plane Perri et al, 2009;Greco et al, 2010). The natural limitation of possible energy gain corresponds to the particles escaping from the turbulent current sheet due to the fast motion along the curved magneticfield lines (Artemyev et al, 2009b;Perri et al, 2011). In this case, some specific properties of electromagnetic turbulence (like a spatial intermittency) can increase the efficiency of the acceleration .…”

Section: A V Artemyev Et Al: High-energy Ion Spectra In the Magnetmentioning

confidence: 99%

Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models

et al. 2014

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Abstract.We investigate the formation of the high-energy (E ∈ [20, 600] keV) ion population in the earth's magnetotail. We collect statistics of 4 years of Interball / Tail observations (1995)(1996)(1997)(1998) in the vicinity of the neutral plane in the magnetotail region (X < −17 R E , |Y | ≤ 20 R E in geocentric solar magnetospheric (GSM) system). We study the dependence of high-energy ion spectra on the thermal-plasma parameters (the temperature T i and the amplitude of bulk velocity v i ) and on the magnetic-field component B z . The ion population in the energy range E ∈ [20, 600] keV can be separated in the thermal core and the power-law tail with the slope (index) ∼ −4.5. Fluxes of the high-energy ion population increase with the growth of B z , v i and especially T i , but spectrum index seems to be independent on these parameters. We have suggested that the high-energy ion population is generated by small scale transient processes, rather than by the global reconfiguration of the magnetotail. We have proposed the relatively simple and general model of ion acceleration by transient bursts of the electric field. This model describes the power-law energy spectra and predicts typical energies of accelerated ions.

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Acceleration and transport of ions in turbulent current sheets: formation of non-maxwelian energy distribution

Cited by 29 publications

References 69 publications

Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

Non-adiabatic Ion Acceleration in the Earth Magnetotail and Its Various Manifestations in the Plasma Sheet Boundary Layer

Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models

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