Reconnection and Waves: A Review with a Perspective

Fujimoto, M.; Shinohara, I.; Kojima, Hirotsugu

doi:10.1007/s11214-011-9807-7

Cited by 71 publications

(64 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Initially separated plasma regions become magnetically connected, and energy stored in magnetic fields is converted into kinetic energy of charged particles [Priest and Forbes, 2000;Fujimoto et al, 2011]. Initially separated plasma regions become magnetically connected, and energy stored in magnetic fields is converted into kinetic energy of charged particles [Priest and Forbes, 2000;Fujimoto et al, 2011].…”

Section: Introductionmentioning

confidence: 99%

Magnetic reconnection and modification of the Hall physics due to cold ions at the magnetopause

André

Toledo‐Redondo

et al. 2016

Geophysical Research Letters

View full text Add to dashboard Cite

Observations by the four Magnetospheric Multiscale spacecraft are used to investigate the Hall physics of a magnetopause magnetic reconnection separatrix layer. Inside this layer of currents and strong normal electric fields, cold (eV) ions of ionospheric origin can remain frozen‐in together with the electrons. The cold ions reduce the Hall current. Using a generalized Ohm's law, the electric field is balanced by the sum of the terms corresponding to the Hall current, the v × B drifting cold ions, and the divergence of the electron pressure tensor. A mixture of hot and cold ions is common at the subsolar magnetopause. A mixture of length scales caused by a mixture of ion temperatures has significant effects on the Hall physics of magnetic reconnection.

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic reconnection and modification of the Hall physics due to cold ions at the magnetopause

André

Toledo‐Redondo

et al. 2016

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…The surfaces between the new magnetic regions, dividing the inflow and outflow plasmas are called separatrices. Separatrices are thin boundary layers between plasmas with different properties (density, temperature, and flow pattern) [1][2][3] and subject to instabilities, wave activity and turbulence [4][5][6]. One of the distinctive features of collisionless magnetic reconnection is the formation of localized low density regions along the separatrices [7,8].…”

Section: Introductionmentioning

confidence: 99%

Three dimensional density cavities in guide field collisionless magnetic reconnection

Lapenta

Divin

Goldman³

et al. 2012

Physics of Plasmas

View full text Add to dashboard Cite

Particle-in-Cell simulations of collisionless magnetic reconnection with a guide field reveal for the first time the three dimensional features of the low density regions along the magnetic reconnection separatrices, the so-called cavities. It is found that structures with further lower density develop within the cavities. Because their appearance is similar to the rib shape, these formations are here called low density ribs. Their location remains approximately fixed in time and their density progressively decreases, as electron currents along the cavities evacuate them. They develop along the magnetic field lines and are supported by a strong perpendicular electric field that oscillates in space. In addition, bipolar parallel electric field structures form as isolated spheres between the cavities and the outflow plasma, along the direction of the low density ribs and of magnetic field lines.

show abstract

“…Although such induction electric field accelerates electrons, the final energy distribution is exponential (see theoretical model and comparison with observations in Taktakishvili et al, 1998). Another possible candidate is lower-hybrid waves often observed in the vicinity of the X-line (see, e.g., Shinohara et al, 1998;Fujimoto et al, 2011). These waves can effectively accelerate electrons via resonant wave-particle interaction.…”

Section: Discussionmentioning

confidence: 99%

“…Also more sophisticated mechanisms related to dynamics of magnetic islands (see, e.g., Drake et al, 2005;Oka et al, 2010;Tanaka et al, 2011) could be responsible for additional acceleration. Finally, it is unclear how electron holes observed near the X-line (see review by Fujimoto et al, 2011, and references therein) can influence electron acceleration. However, here we notice that neither wave-particle resonant interaction nor various transient processes related to the reconnection can produce observed double-power law spectra (see, e.g., Birn et al, 2004Birn et al, , 2012, and references therein) and should be considered only as additional effects for the acceleration in X-line.…”

Section: Discussionmentioning

confidence: 99%

Double power-law spectra of energetic electrons in the Earth magnetotail

et al. 2013

View full text Add to dashboard Cite

Abstract. In this paper, we consider electron acceleration in the vicinity of X-line and corresponding formation of energy spectra. We develop an analytical model including the effect of the electron trapping by electrostatic fields and surfing acceleration. Speiser, Fermi and betatron mechanisms of acceleration are also taken into account. Analytical estimates are verified by the numerical integration of electron trajectories. The surfing mechanism and adiabatic heating are responsible for the formation of the double power-law spectrum in agreement with the previous studies. The energy of the spectrum knee is about ∼150 keV for typical conditions of the Earth magnetotail. We compare theoretical results with the spacecraft observations of electron double power-law spectra in the magnetotail and demonstrate that the theory is able to describe typical energy of the spectra knee. We also estimate the role of relativistic effects and magnetic field fluctuations on the electron acceleration: the acceleration is more stable for relativistic electrons, while fluctuations of the magnetic field cannot significantly decrease the gained energy for typical magnetospheric conditions.

show abstract

Reconnection and Waves: A Review with a Perspective

Cited by 71 publications

References 84 publications

Magnetic reconnection and modification of the Hall physics due to cold ions at the magnetopause

Magnetic reconnection and modification of the Hall physics due to cold ions at the magnetopause

Three dimensional density cavities in guide field collisionless magnetic reconnection

Double power-law spectra of energetic electrons in the Earth magnetotail

Contact Info

Product

Resources

About