A Model of a Single‐Loop Flare: Disruption of a Magnetic Flux Tube Driven by Collision of Two Moving Solitary Magnetic Kinks

Sakai, Jun–ichi; Nishi, Katsuki; Соколов, И. В.

doi:10.1086/341615

Cited by 7 publications

(8 citation statements)

References 15 publications

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“…Magnetic rings are key MHD structures. Indeed, [23] suggested that rings produced by the collision of two solitary magnetic kinks along a straight magnetic flux tube play a role in solar flare formation, and [24] have computed the dynamics of linked magnetic rings in order to determine the role of magnetic helicity in magnetic field decay. For the case of magnetic tangles/knots with zero net magnetic helicity, [25] have shown that such structures are unstable, and split into two packages moving in opposite directions, each with finite and opposite magnetic helicity.…”

mentioning

confidence: 99%

Interactions between vortex tubes and magnetic-flux rings at high kinetic and magnetic Reynolds numbers

Kivotides

2018

Phys. Rev. Fluids

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The interactions between vortex tubes and magnetic-flux rings in incompressible MHD are inves- [MHD]), and, via its convection by the velocity field, becomes turbulent, developing coherent structures of its own. Thus, it is conceptually important to understand the interactions between structures in the gauge and inertial fields, and the way these can help understand (in a structural way) some of the complexity of turbulent chaos, (b) the presence of the Lorentz force in the Navier-Stokes equations enables the depiction of wave phenomena in the latter (Alfven waves), which lead to novel (in comparison with incompressible turbulence)

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confidence: 99%

Interactions between vortex tubes and magnetic-flux rings at high kinetic and magnetic Reynolds numbers

Kivotides

2018

Phys. Rev. Fluids

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“…One possible scenario to explain the above observation is as follows. The single loop with β = 0.5 in the center of the loop is supposed to be disrupted by the mechanism recently proposed by Sakai et al (2002), then the disrupted part of the loop with high energy protons as well as hot thermalized protons could move up and interact with the overlying other loop. The interaction between the ascending magnetized plasma blobs and the other loop can lead to magnetic reconnection in the interaction region, where the proton could be accelerated further by the inductive electric field associated with the magnetic reconnection mostly in one direction along the guiding magnetic field.…”

Section: Discussionmentioning

confidence: 98%

Proton acceleration during coalescence of two parallel current loops in solar flares

Sakai

Shimada

2004

A&A

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Abstract. We investigate the plasma dynamics during coalescence of two parallel current loops in solar flares by using a resistive three-dimensional MHD simulation code, paying particular attention finding the most effective electromagnetic fields for the production of high-energy protons. Next we investigate the orbit of many protons in the electromagnetic fields obtained from the MHD simulations. We investigate two cases of the coalescence process: (1) co-helicity reconnection where only the poloidal magnetic field produced from the axial currents dissipates and (2) counter-helicity reconnection where both poloidal and axial magnetic fields dissipate. We found a bump-on-tail distribution in the same direction as the original loop current for both the cases of co-helicity and counter-helicity. It is shown that the maximum proton energy exceeds the energy (2.223 MeV) of the observed prompt nuclear de-excitation lines of gamma-ray, and that proton energy spectrum is neither a pure power-law type nor a pure exponential type. We may conclude that anisotropic proton acceleration along the loop can be realized both for co-helicity and counter-helicity reconnection during the coalescence of two parallel loops.

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“…In this section we briefly summarize the concept of a "moving solitary magnetic kink" (MoSMaK) that was found from 3-D MHD simulation (Sakai et al 2002). We investigate head-on collision process of two plasma blobs in a magnetic flux tube along the y-axis.…”

Section: A Model Of a Single-loop Flarementioning

confidence: 99%

“…Recently Sakai et al (2002) investigated head-on and rearend collision process of dense plasma blobs moving along a magnetic flux tube with axial current, by using a resistive 3-D MHD code. They found a new nonlinear elementary excitation called "moving solitary magnetic kink" (MoSMaK) that can be excited near the interface of colliding plasma blobs.…”

Section: Introductionmentioning

confidence: 99%

Proton acceleration in a single-loop disrupted during collision of two moving solitary magnetic kinks

Kakimoto¹,

Sakai²

2004

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Abstract.We investigate a new model of single-loop flare based on the fact that a magnetic flux tube with axial current can be explosively disrupted during collision of two moving solitary magnetic kinks (MoSMaK), particularly paying attention to an acceleration mechanism of high energy protons. By using three-dimensional electromagnetic fields obtained from a resistive three-dimensional MHD equations during the single-loop flare, we investigate the orbit of many protons to obtain their energy spectra. We found that the protons can be accelerated to γ-ray-emitting energies (>1 MeV) with double power-law spectra up to about 25 MeV. There appears a breaking point of the index of the power-law spectra from 1.8 to 2.1 near 10 MeV. The protons are accelerated mainly in one direction along the loop by the electric field produced near the three-dimensional localized current associated with the magnetic reconnection process in the disrupted loop. We study the loop disruption for two different plasma beta in the center of the loop; β = 0.5 and β = 0.05. In a high beta case (β = 0.5), the disruption of the loop is more violent than that of β = 0.05. We found that the proton acceleration for the case of β = 0.5 occurs mainly at two different regions; one is inside the loop and the other is in the upper part of the disrupting loop. However, the energy spectra of protons are very similar for both cases.

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A Model of a Single‐Loop Flare: Disruption of a Magnetic Flux Tube Driven by Collision of Two Moving Solitary Magnetic Kinks

Cited by 7 publications

References 15 publications

Interactions between vortex tubes and magnetic-flux rings at high kinetic and magnetic Reynolds numbers

Interactions between vortex tubes and magnetic-flux rings at high kinetic and magnetic Reynolds numbers

Proton acceleration during coalescence of two parallel current loops in solar flares

Proton acceleration in a single-loop disrupted during collision of two moving solitary magnetic kinks

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