Magnetic reconnection, electric field, and particle acceleration in the July 14, 2000 solar flare

Сомов, Б. В.; Oreshina, I. V.; Коваленко, Ю. А.

doi:10.1134/s1063773708050058

Cited by 19 publications

(2 citation statements)

References 23 publications

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“…A variety of observational techniques have yielded estimates of peak electric field strengths in flares and erupting prominences (Somov et al 2008;Foukal et al 1987;Qiu et al 2002). These have ranged from a few tens of V/m to more than 1 kV/m, i.e.…”

Section: Electric Fieldmentioning

confidence: 99%

Effect of binary collisions on electron acceleration in magnetic reconnection

Burge

MacKinnon

Petkaki

2014

A&A

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Context. The presence of energetic X-ray sources in the solar corona indicates there are additional transport effects in the acceleration region. A prime method of investigation is to add collisions into models of particle behaviour at the reconnection region. Aims. We investigate electron test particle acceleration in a simple model of an X-type reconnection region. In particular, we explore the possibility that collisions will cause electrons to re-enter the acceleration more frequently, in turn causing particles to be accelerated to high energies. Methods. The deterministic (Lorentz) description of particle gyration and acceleration has been coupled to a model for the effects of collisions. The resulting equations are solved numerically using Honeycutt's extension of the RK4 method to stochastic differential equations. This approach ensures a correct description of collisional energy loss and pitch-angle scattering combined with a sufficiently precise description of gyro-motion and acceleration. Results. Even with initially mono-energetic electrons, the competition between collisions and acceleration results in a distribution of electron energies. When realistic model parameters are used, electrons achieve X-ray energies. A possible model for coronal hard X-ray sources is indicated. Conclusions. Even in competition with energy losses, pitch-angle scattering results in a small proportion of electrons reaching higher energies than they would in a collisionless situation.

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Section: Electric Fieldmentioning

confidence: 99%

Effect of binary collisions on electron acceleration in magnetic reconnection

Burge

MacKinnon

Petkaki

2014

A&A

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“…Dalla and Browning (2005) found that in a 3D static X-type neutral point, electric fields of 1.5kV/m were required to reach these energies (in a system where particles were allowed to move equal distances in x, y and z). The electric field strength in solar flares (Somov, Oreshina, and Kovalenko (2008)) and erupting prominences (Foukal, Little, and Gilliam (1987)) has been measured to be in the region of 1kV/m, around 1000 times larger than the peak value in case 5, which is ≈ 1 V/m. However, solar flare protons with energies in the gigaelectronvolt range, much greater than the energies achieved with this small field, have been observed (e.g.…”

Section: Energy Distributions: Ionsmentioning

confidence: 99%

Particle Acceleration in the Presence of Weak Turbulence at an X-Type Neutral Point

2012

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We simulate the likely noisy situation near a reconnection region by superposing many 2D linear reconnection eigenmodes. The superposition of modes on the steady state X-type magnetic field creates multiple X-and O-type neutral points close to the original neutral point and so increases the size of the non-adiabatic region. We study test particle trajectories of initially thermal protons in these fields. Protons become trapped in this region and are accelerated by the turbulent electric field to energies up to 1 MeV in time scales relevant to solar flares. Higher energies are achieved due to the interaction of particles with increasingly turbulent electric and magnetic fields.

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Solar-Type Flares in Laboratory and Space

Сомов

2013

Astrophysics and Space Science Library

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Magnetic reconnection, electric field, and particle acceleration in the July 14, 2000 solar flare

Cited by 19 publications

References 23 publications

Effect of binary collisions on electron acceleration in magnetic reconnection

Effect of binary collisions on electron acceleration in magnetic reconnection

Particle Acceleration in the Presence of Weak Turbulence at an X-Type Neutral Point

Solar-Type Flares in Laboratory and Space

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