The dynamics of the energetic proton bursts in the course of the magnetic field topology reconstruction in the earth‘s magnetotail

Zeleny, L. M.; Lipatov, A. S.; Ломинадзе, Д. Г.; Taktakishvili, A. L.

doi:10.1016/0032-0633(84)90167-3

Cited by 32 publications

(16 citation statements)

References 13 publications

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“…+ Ions in the Reconnection Region The mechanism of particle acceleration near X-lines and in the region of magnetic reconnection may lead to an energy gain from several hundreds of eV up to the MeV range (e.g., Zelenyi et al 1984). Observations of energetic O + bursts accelerated earthward and tailward of the NENL during substorm events were reported by Zong et al (1998).…”

Section: Acceleration Of Omentioning

confidence: 99%

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

et al. 2014

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Knowledge of the ion composition in the near-Earth's magnetosphere and plasma sheet is essential for the understanding of magnetospheric processes and instabilities. The presence of heavy ions of ionospheric origin in the magnetosphere, in particular oxygen (O + ), influences the plasma sheet bulk properties, current sheet (CS) thickness and its structure. It affects reconnection rates and the formation of Kelvin-Helmholtz instabilities. This has profound consequences for the global magnetospheric dynamics, including geomagnetic storms and substorm-like events. The formation and demise of the ring current and the radiation belts are also dependent on the presence of heavy ions. In this review we cover recent advances in observations and models of the circulation of heavy ions in the magne- tosphere, considering sources, transport, acceleration, bulk properties, and the influence on the magnetospheric dynamics. We identify important open questions and promising avenues for future research.

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Section: Acceleration Of Omentioning

confidence: 99%

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

et al. 2014

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“…Several authors recognized that an explosive phase or reconnection phase might account for important features of Earth's magnetotail substorm [e.g., Coppi et al, 1966;Schindler, 1974Schindler, , 1984Tsurutani et al, 1976;Galeev et al, 1978;Coroniti and Kennel, 1979;Birn and Hones, 198! ;Zeleny et al, 1984, and references therein] with a tearing mode instability being the leading candidate.…”

Section: Models For Instabilities In Magnetic Field Reconnectionmentioning

confidence: 99%

Acceleration of charged particles in Mercury's magnetosphere

Eraker¹,

Simpson²

1986

J. Geophys. Res.

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High-intensity bursts of electrons with energies up to ---600 keV were discovered during two nightside encounters of the Mariner 10 spacecraft with the planet Mercury. During the first encounter, Mariner 10 passed through the magnetotail plasma sheet region on March 29, 1974, and during the third encounter, on March 16, 1975, the spacecraft passed through the near-polar region. Initial reports on these results (Simpson et al., 1974), which were based on 6-and 1.2-s averages of the counting rates, strongly indicated that impulsive electron acceleration, probably by magnetic field reconnection, occurred in the magnetotail of Mercury and that this phenomenon was similar to Earth's substorm effect. The present paper is a detailed analysis of the encounter measurements based on the highest time resolution available for the particle counting rates, namely 0.6-s intervals, and the correlation of the counting rates with the 0.04-s measurements of the magnetic field. This analysis shows that the time-intensity characteristics of the charged particle bursts, whether occurring in sequences of bursts or as single bursts, are similar for both encounters; namely, (1) individual burst onsets are ---0.5 s per decade of rising intensity, (2) exponential decay time constants are ---1.5 s per decade, (3) the repetition period for the sequences of bursts is ---5 to 6 s, and (4) the maximum observed intensity of successive bursts in a sequence decreases exponentially. These observations are not artifacts of the encounter measurements but are characteristics of the particles which arrive at the point of detection promptly from the acceleration source region. Magnetosonic waves have been found near the magnetotail plasma sheet which were associated with the onsets of the two most intense burst sequences. Assuming that these waves are similar to the injection fronts of substorms described at Earth and that they indicate the presence of a neutral sheet current, an estimate of the maximum cross-tail potential yields <2 x 104 V. Thus this mechanism could not account for the acceleration of the high-energy electrons. Furthermore, acceleration mechanisms based on stochastic processes also appear to be excluded. On the other hand, the direct evidence at Mercury for the acceleration of electrons to 0.5 MeV within 1-2 s argues for acceleration in an inductive electric field within the plasma sheet of Mercury's magnetotail produced during explosive reconnection of the magnetic field. It is pointed out that instabilities leading to explosive reconnection, such as via the tearing mode instability, could provide the required free energy for particle acceleration. The problem of how this mechanism could explain the observed quasi-periodic electron burst sequences at Mercury is discussed. From measurements of the total electron energy in a sequence of bursts it is found that for 1% efficiency in the acceleration mechanism the required total magnetic free energy is of the order of 1012 joules, depending upon the assumed electron energy spectrum and th...

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“…Some mechanism of particle acceleration in limited spatial regions (such as planetary magnetospheres and the solar corona) like the famous Fermi acceleration mechanism (Fermi, 1949) is needed to explain the formation of power tail (f ∼ε −1−κ ) of energy distribution and presence of groups of particles with large energy values (ε ε ). Different possible mechanisms were proposed such as acceleration near the CS X-line (Hoshino, 2005;Pritchett, 2006;Drake et al, 2006), ion acceleration by electric field due to the growth of tearing instability (Zelenyi et al, 1984;, quasiadiabatic ion acceleration in the vicinity of the magnetotail neutral sheet by the dawn-dusk electrostatic electric field (Speiser, 1967;Lyons and Speiser, 1982;Ashour-Abdalla et al, 1993, Litvinenko andSomov, 1993;Vainchtein et al, 2005;Zelenyi et al, 2007), particle acceleration by MHD turbulence in the solar corona (Kobak and Ostrowski, 2000;Dmitruk et al, 2004), acceleration due to dipolarization in the Earth's magnetosphere (Delcourt and Sauvaud, 1994;Delcourt, 2002;Apatenkov et al, 2007;Ono et al, 2009). In this paper we suggest another possible mechanism of acceleration which can operate in dynamic regions of CS.…”

Section: Introductionmentioning

confidence: 99%

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

Artemyev

Zelenyǐ

Malova

et al. 2009

Nonlin. Processes Geophys.

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Abstract. The paper is devoted to particle acceleration in turbulent current sheet (CS). Our results show that the mechanism of CS particle interaction with electromagnetic turbulence can explain the formation of power law energy distributions. We study the ratio between adiabatic acceleration of particles in electric field in the presence of stationary turbulence and acceleration due to electric field in the case of dynamic turbulence. The correlation between average energy gained by particles and average particle residence time in the vicinity of the neutral sheet is discussed. It is also demonstrated that particle velocity distributions formed by particle-turbulence interaction are similar in essence to the ones observed near the far reconnection region in the Earth's magnetotail.

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The dynamics of the energetic proton bursts in the course of the magnetic field topology reconstruction in the earth‘s magnetotail

Cited by 32 publications

References 13 publications

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

Acceleration of charged particles in Mercury's magnetosphere

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

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