Energetic electron acceleration during multi-island coalescence

2008 ◽  
Vol 15 (10) ◽  
pp. 102105 ◽  
Author(s):  
P. L. Pritchett
Keyword(s):  
Energetic Electron ◽  
Electron Acceleration ◽  
Island Coalescence

Electron acceleration via magnetic island coalescence

2009 ◽  
Author(s):  
I. Shinohara ◽  
T. Yumura ◽  
K. G. Tanaka ◽  
M. Fujimoto ◽  
Masfumi Hirahara ◽  
...  
Keyword(s):  
Electron Acceleration ◽  
Magnetic Island ◽  
Island Coalescence

scholarly journals Energetic electron acceleration by unsteady magnetic reconnection

2013 ◽  
Vol 9 (7) ◽  
pp. 426-430 ◽  
Author(s):  
H. S. Fu ◽  
Yu. V. Khotyaintsev ◽  
A. Vaivads ◽  
A. Retinò ◽  
M. André
Keyword(s):  
Magnetic Reconnection ◽  
Energetic Electron ◽  
Electron Acceleration

Energetic electron acceleration during magnetic reconnection

2020 ◽  
Author(s):  
Huishan Fu
Keyword(s):  
Numerical Simulations ◽  
Magnetic Reconnection ◽  
Magnetic Energy ◽  
Energetic Electron ◽  
Electron Acceleration ◽  
Particle Energy ◽  
Acceleration Process ◽  
The Earth

<p>During magnetic reconnection, magnetic energy is explosively converted to particle energy and consequently electrons are accelerated to hundreds of keV that are dangerous to spacecraft and astronauts. To date, how and where the acceleration happens during reconnection is still unknown. Also, how efficient can the acceleration be remains a puzzle. Using spacecraft measurements (e.g., Cluster and MMS) and numerical simulations, many attempts have been made to answer these questions during the last twenty years. In this talk, I will briefly review these progresses and then show our recent results in understanding these issues. Specifically, I will (1) report a super-efficient electron acceleration by magnetic reconnection in the Earth’s magnetotail, during which electron fluxes are enhanced by 10000 times within 30 seconds; (2) discuss the mechanisms leading to super-efficient electron acceleration; (3) report the first evidence of electron acceleration at a reconnecting magnetopause, during which the acceleration process is nonadiabatic; and (4) report electron acceleration in the </p>

scholarly journals Bi-layer structure of counterstreaming energetic electron fluxes: a diagnostic tool of the acceleration mechanism in the Earth's magnetotail

2010 ◽  
Vol 28 (2) ◽  
pp. 455-477 ◽  
Author(s):  
D. V. Sarafopoulos
Keyword(s):  
Magnetic Field ◽  
Electric Fields ◽  
Layer Structure ◽  
Energetic Electron ◽  
Electron Acceleration ◽  
Recovery Phase ◽  
Curvature Radius ◽  
Distinct Region ◽  
Acceleration Mechanism ◽  
The Magnetic Field

Abstract. For the first time we identify a bi-layer structure of energetic electron fluxes in the Earth's magnetotail and establish (using datasets mainly obtained by the Geotail Energetic Particles and Ion Composition (EPIC/ICS) instrument) that it actually provides strong evidence for a purely spatial structure. Each bi-layer event is composed of two distinct layers with counterstreaming energetic electron fluxes, parallel and antiparallel to the local ambient magnetic field lines; in particular, the tailward directed fluxes always occur in a region adjacent to the lobes. Adopting the X-line as a standard reconnection model, we determine the occurrence of bi-layer events relatively to the neutral point, in the substorm frame; four (out of the shown seven) events are observed earthward and three tailward, a result implying that four events probably occurred with the substorm's local recovery phase. We discuss the bi-layer events in terms of the X-line model; they add more constraints for any candidate electron acceleration mechanism. It should be stressed that until this time, none proposed electron acceleration mechanism has discussed or predicted these layered structures with all their properties. Then we discuss the bi-layer events in terms of the much promising "akis model", as introduced by Sarafopoulos (2008). The akis magnetic field topology is embedded in a thinned plasma sheet and is potentially causing charge separation. We assume that as the Rc curvature radius of the magnetic field line tends to become equal to the ion gyroradius rg, then the ions become non-adiabatic. At the limit Rc=rg the demagnetization process is also under way and the frozen-in magnetic field condition is violated by strong wave turbulence; hence, the ion particles in this geometry are stochastically scattered. In addition, ion diffusion probably takes place across the magnetic field, since an intense pressure gradient is directed earthward; hence, ions are ejected tailward of akis. This way, in front of akis an "ion capsule region" is formed with net positive charge. In between them a distinct region with an electric field E⊥ orthogonal to the magnetic field is emerged; E⊥ in front of akis is directed earthward. The field-aligned and highly anisotropic energetic electron populations have probably resulted via spatially separated antiparallel and field-aligned electric fields being the very heart of the acceleration source. We assume that the ultimate cause for the field-aligned electric fields are the net positive capsule charge and the net negative charge trapped at the tip of akis; both charges will be eventually neutralized through field aligned currents, but they remain unshielded for sufficient time to produce the observed events.

scholarly journals Cluster observations of energetic electron acceleration within earthward reconnection jet and associated magnetic flux rope

2021 ◽  
Author(s):  
Andris Vaivads ◽  
Yuri V. Khotyaintsev ◽  
Alessandro Retino ◽  
Elena A. Kronberg ◽  
Patrick W. Daly ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Energetic Electron ◽  
Flux Rope ◽  
Electron Acceleration ◽  
Magnetic Flux Rope

Energetic Electron Acceleration in Unconfined Reconnection Jets

2019 ◽  
Vol 881 (1) ◽  
pp. L8 ◽  
Author(s):  
G. Chen ◽  
H. S. Fu ◽  
Y. Zhang ◽  
Xiaocan Li ◽  
Y. S. Ge ◽  
...  
Keyword(s):  
Energetic Electron ◽  
Electron Acceleration
Sign in / Sign up

Export Citation Format

Share Document