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Electron Acceleration at Quasi-Parallel Shocks in The Solar Corona and Its Signature in Solar Type II Radio Bursts

Published online by Cambridge University Press:  12 April 2016

G. Mann  and
H. Lühr
G. Mann
Affiliation:
Astrophysikalisches Institut Potsdam, 14552 Tremsdorf, Germany
H. Lühr
Affiliation:
Institut für Geophysik und Meteorologie der Technischen Universität, 38106 Braunschweig, Germany

Abstract

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Recently, strong large amplitude magnetic field structures (SLAMS) have been observed as a common phenomenon in the vicinity of the quasi-parallel region of Earth’s bow shock. A quasi-parallel shock transition can be considered as a patchwork of SLAMS. Using the data of the AMPTE/IRM magnetometer the properties of SLAMS are studied. Within SLAMS the magnetic field is strongly deformed and, thus, the magnetic field geometry is locally swung into a quasi-perpendicular regime. Therefore, electrons can locally be accelerated to high energies within SLAMS. Assuming that SLAMS also exist in the vicinity of supercritical, quasi-parallel shocks in the solar corona, they are able to generate radio radiation via the enhanced Langmuir turbulence excited by the accelerated electrons. Since SLAMS are connected with strong density enhancements, the aforementioned mechanism can explain the multiple-lane structure often occurred in solar Type II radio bursts.

Subject headings: acceleration of particles — Earth — shock waves — Sun: corona — Sun: radio radiation

Type
Interplanetary Medium
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 577 - 581
Copyright
Copyright © The American Astronomical Society 1994

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