Particle acceleration mechanisms in the auroral acceleration region

1992 ◽  
Vol 20 (6) ◽  
pp. 740-744 ◽  
Author(s):  
M. Gedalin ◽  
W. Peter
Keyword(s):  
Particle Acceleration ◽  
Acceleration Region ◽  
Auroral Acceleration Region

scholarly journals Gamma-ray production in selected Wolf-Rayet binaries

2003 ◽  
Vol 212 ◽  
pp. 150-151
Author(s):  
Paula Benaglia ◽  
Gustavo E. Romero
Keyword(s):  
Particle Acceleration ◽  
Gamma Ray ◽  
Thermal Flux ◽  
Detection Threshold ◽  
High Energy ◽  
Early Type ◽  
Acceleration Region ◽  
Thermal Radio Emission ◽  
Inverse Compton ◽  
Γ Ray

In the colliding wind region of early-type binaries, electrons can be accelerated up to relativistic energies, as demonstrated by the detection of non-thermal radio emission from several WR+OB systems. The particle acceleration region is exposed to strong photon fields, and inverse-Compton cooling of the electrons could result in a substantial high-energy non-thermal flux. We present here preliminary results of a study of the binaries WR 140, WR 146, and WR 147 in the light of recent radio and γ-ray observations. We show that under reasonable assumptions WR 140 can produce the γ-ray flux from the GRO-egret source 3EG J 2022+4317. WR 146 and WR 147 are below the detection threshold.

scholarly journals Temporal evolution and electric potential structure of the auroral acceleration region from multispacecraft measurements

2012 ◽  
Vol 117 (A12) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. Forsyth ◽  
A. N. Fazakerley ◽  
A. P. Walsh ◽  
C. E. J. Watt ◽  
K. J. Garza ◽  
...  
Keyword(s):  
Electric Potential ◽  
Temporal Evolution ◽  
Acceleration Region ◽  
Auroral Acceleration Region ◽  
Potential Structure

scholarly journals <i>Letter to the Editor</i> Low-frequency electric field fluctuations and field-aligned electron beams around the edge of an auroral acceleration region

2001 ◽  
Vol 19 (3) ◽  
pp. 389-393 ◽  
Author(s):  
W. Miyake ◽  
R. Yoshioka ◽  
A. Matsuoka ◽  
T. Mukai ◽  
T. Nagatsuma
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Electron Beams ◽  
Low Frequency ◽  
Static Field ◽  
Acceleration Region ◽  
Auroral Acceleration Region ◽  
Field Fluctuations ◽  
Current Region ◽  
Frequency Electric Field

Abstract. Electron beams narrowly collimated to the magnetic field line were observed continuously from a down-ward current region to an auroral acceleration region (i.e., upward current region). They were well correlated with low-frequency electric field fluctuations in the auroral acceleration region as well as in the adjacent downward current region. Magnetic field fluctuations were found only in the downward current region. The analysis suggests that static field-aligned electric fields are not fully responsible for the filed-aligned electron acceleration; the ac electric field, presumably associated with Alfvenic fluctuations, should also be involved in the acceleration of ionospheric electrons.Key words. Ionosphere (particle acceleration) – Magnetospheric physics (auroral phenomena; magnetosphere-ionosphere interactions)

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