Formation of a localized acceleration potential during magnetic reconnection with a guide field

Egedal, J.; Daughton, W.; Drake, J. F.; Katz, N.; Lê, A.
May 2009
Physics of Plasmas;May2009, Vol. 16 Issue 5, p050701
Academic Journal
Magnetic reconnection near the surface of the sun and in the Earth’s magnetotail is associated with the production of highly energetic electrons. Direct acceleration in the reconnection electric field has been proposed as a possible mechanism for energizing these electrons. Here, however, we use kinetic simulations of guide-field reconnection to show that in two-dimensional (2D) reconnection the parallel electric field, E∥ in the reconnection region is localized and its structure does not permit significant energization of the electrons. Rather, a large fraction of the electrons become trapped due to a sign reversal in E∥, imposing strict constraints on their motions and energizations. Given these new results, simple 2D models, which invoke direct acceleration for energizing electrons during a single encounter with a reconnection region, need to be revised.


Related Articles

  • Electron acceleration by lower hybrid waves in magnetic reconnection regions. Cairns, Iver H.; McMillan, B. F. // Physics of Plasmas;Oct2005, Vol. 12 Issue 10, p102110 

    A new model for electron acceleration in magnetic reconnection regions is developed analytically, tested using quasilinear simulations, and the qualitative predictions compared with observations of reconnection in Earth’s magnetotail and the solar corona. The model involves lower hybrid...

  • Electron acceleration via magnetic island coalescence. Shinohara, I.; Yumura, T.; Tanaka, K. G.; Fujimoto, M. // AIP Conference Proceedings;6/16/2009, Vol. 1144 Issue 1, p15 

    Electron acceleration via fast magnetic island coalescence that happens as quick magnetic reconnection triggering (QMRT) proceeds has been studied. We have carried out a three-dimensional full kinetic simulation of the Harris current sheet with a large enough simulation run for two magnetic...

  • Particle Acceleration in the Magnetotail and Aurora. Birn, J.; Artemyev, A.; Baker, D.; Echim, M.; Hoshino, M.; Zelenyi, L. // Space Science Reviews;Nov2012, Vol. 173 Issue 1-4, p49 

    This paper deals with acceleration processes in the magnetotail and the processes that enhance particle precipitation from the tail into the ionosphere through electric fields in the auroral acceleration region, generating or intensifying discrete auroral arcs. Particle acceleration in the...

  • High-Field, μJ-Class THz Pulses from a Laser Wakefield Accelerator. Matlis, N. H.; Plateau, G. R.; van Tilborg, J.; Geddes, C. G. R.; Tóth, Cs.; Schroeder, C. B.; Esarey, E.; Leemans, W. P. // AIP Conference Proceedings;1/22/2008, Vol. 1086 Issue 1, p713 

    We present observation and characterization of microjoule-MV/cm-level THz pulses from a laser wakefield accelerator. THz emitted as coherent transition radiation from the plasma-vacuum boundary is collected and refocused by off-axis parabolas to a test stand where a suite of diagnostics is...

  • The role of electron heat flux in guide-field magnetic reconnection. Hesse, Michael; Kuznetsova, Masha; Birn, Joachim // Physics of Plasmas;Dec2004, Vol. 11 Issue 12, p5387 

    A combination of analytical theory and particle-in-cell simulations are employed in order to investigate the electron dynamics near and at the site of guide field magnetic reconnection. A detailed analysis of the contributions to the reconnection electric field shows that both bulk inertia and...

  • Physical origin of the quadrupole out-of-plane magnetic field in Hall-magnetohydrodynamic reconnection. Uzdensky, Dmitri A.; Kulsrud, Russell M. // Physics of Plasmas;Jun2006, Vol. 13 Issue 6, p062305 

    A quadrupole pattern of the out-of-plane component of the magnetic field inside a reconnection region is seen as an important signature of the Hall-magnetohydrodynamic regime of reconnection. It has been first observed in numerical simulations and just recently confirmed in the Magnetic...

  • High ambipolar and balanced carrier mobility in regioregular poly(3-hexylthiophene). Choulis, S. A.; Kim, Y.; Nelson, J.; Bradley, D. D. C.; Giles, M.; Shkunov, M.; McCulloch, I. // Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3890 

    The carrier transport of carefully purified regioregular poly(3-hexylthiophene) films has been studied using time-of-flight photocurrent measurements. We find balanced ambipolar transport with a room-temperature mobility for holes of 3×10-4 cm2 V-1 s-1 and for electrons of 1.5×10-4 cm2...

  • Bound electron states in a system of coupled quantum waveguides in a transverse electric field. Matveev, D. G.; Popov, I. Yu. // Technical Physics Letters;Nov2009, Vol. 35 Issue 11, p1007 

    It is shown that a bound electron state exists in a system of quantum waveguides laterally coupled via a small window and placed in a transverse electric field. A field-induced shift of the eigenvalue is estimated using a variational method.

  • Multiplication of runaway electrons in a neutral gas under the action of a strong field. Tsendin, L. D. // Technical Physics Letters;Nov2009, Vol. 35 Issue 11, p1044 

    Simple analytical expressions are obtained for the time of runaway electron multiplication in an electric field with the strength exceeding the maximum retarding force. As the field increases, the multiplication time first decreases and then rapidly (exponentially) grows so that the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics