Observational Evidence for Stochastic Shock Drift Acceleration of Electrons at the Earth's Bow Shock.,Physical Review Letters

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Observational Evidence for Stochastic Shock Drift Acceleration of Electrons at the Earth's Bow Shock.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-02-14 , DOI: 10.1103/physrevlett.124.065101
T Amano ₁ , T Katou ₁ , N Kitamura ₁ , M Oka ₂ , Y Matsumoto ₃ , M Hoshino ₁ , Y Saito ₄ , S Yokota ₅ , B L Giles ₆ , W R Paterson ₆ , C T Russell ₇ , O Le Contel ₈ , R E Ergun ₉ , P-A Lindqvist ₁₀ , D L Turner ₁₁ , J F Fennell ₁₁ , J B Blake ₁₁

Affiliation

Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan.
Space Sciences Laboratory, University of California, Berkeley, California 94720, USA.
Department of Physics, Chiba University, Chiba 263-8522, Japan.
Institute of Space and Astronautical Science, Sagamihara 252-5210, Japan.
Department of Earth and Space Science, Osaka University, Toyonaka 560-0043, Japan.
NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California 90095, USA.
Laboratoire de Physique des Plasmas, CNRS/Ecole Polytechnique/Sorbonne Université/Univ. Paris-Sud/Obs. de Paris, Paris F-75252, France.
Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303, USA.
KTH Royal Institute of Technology, Stockholm 11428, Sweden.
Space Sciences Department, The Aerospace Corporation, El Segundo, California 90245, USA.

The first-order Fermi acceleration of electrons requires an injection of electrons into a mildly relativistic energy range. However, the mechanism of injection has remained a puzzle both in theory and observation. We present direct evidence for a novel stochastic shock drift acceleration theory for the injection obtained with Magnetospheric Multiscale observations at the Earth's bow shock. The theoretical model can explain electron acceleration to mildly relativistic energies at high-speed astrophysical shocks, which may provide a solution to the long-standing issue of electron injection.

中文翻译：

地球弓激波下电子的随机激波漂移加速的观测证据。

电子的一阶费米加速需要将电子注入到相对论的能量范围内。但是，无论从理论上还是从观察角度来看，注射的机理仍然是一个难题。我们提供了新颖的随机激波漂移加速理论的直接证据，该理论是利用地球弓激波的磁层多尺度观测获得的。该理论模型可以解释在高速天体物理冲击下电子加速到相对论能量的过程，这可以为长期存在的电子注入问题提供解决方案。

更新日期：2020-02-14

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