Xudong Guo

Purple Mountain Observatory

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Y. P. Zhang

Institute of Modern Physics

Dimitrios Kyratzis

Gran Sasso Science Institute

Yifeng Wei

University of Science and Technology of China

M.M. Ma

Shenyang Medical College

X. Y. Peng

Affiliated Hospital of Southwest Medical University

M. Stolpovskiy

University of Geneva

X Li

Chinese Academy of Sciences

Jun-Jie Wei

University of Science and Technology of China

Tieyan Wang

Yunnan University

S Wang

Shanghai Jiao Tong University

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Chinese Academy of Sciences

113

University of Science and Technology of China

Purple Mountain Observatory

University of Chinese Academy of Sciences

Campbell Collaboration

Institute of High Energy Physics

Istituto Nazionale di Fisica Nucleare

National Space Science Center

Institute of Modern Physics

University of Geneva

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Excitation of Low‐ and High‐Frequency Magnetosonic Whistler Waves Associated With SLAMS in the Terrestrial Foreshock

Geophysical Research Letters (2024)

Yuhang Yao Jinsong Zhao H. S. Fu Y. Lin W. Z. Zhang

Abstract Based on observations from the Magnetospheric Multiscale mission, this study presents an analysis of a short large‐amplitude magnetic structures (SLAMS) event with simultaneous occurrence of low‐ and high‐frequency magnetosonic whistler waves. It was found that low‐frequency magnetosonic whistler waves around the lower‐hybrid frequency emerge in the presence of solar wind ions and local low‐energy ions in the trailing region of SLAMS. Additionally, counter‐propagating whistler waves (the high‐frequency branch of the magnetosonic whistler wave) are observed within SLAMS, coinciding with a perpendicular temperature anisotropy in the electron population. Instability analyses demonstrate that these low‐frequency waves are induced by the two‐stream instability associated with the cross‐field relative velocity between low‐energy ions and electrons, while whistler waves are locally generated by the whistler anisotropy instability. Our results shed light on the impact of SLAMS on particle and wave dynamics in the terrestrial foreshock.

Whistler

10.1029/2024gl110433

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Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission

Physical Review Letters (2021)

Francesco Alemanno Q. An P. Azzarello Felicia Barbato P. Bernardini

The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening of the spectrum is observed at an energy of about 1.3 TeV, similar to previous observations. In addition, a spectral softening at about 34 TeV is revealed for the first time with large statistics and well controlled systematic uncertainties, with an overall significance of 4.3σ. The DAMPE spectral measurements of both cosmic protons and helium nuclei suggest a particle charge dependent softening energy, although with current uncertainties a dependence on the number of nucleons cannot be ruled out.Received 5 January 2021Revised 25 March 2021Accepted 6 April 2021DOI:https://doi.org/10.1103/PhysRevLett.126.201102© 2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmic ray & astroparticle detectorsCosmic ray composition & spectraParticle astrophysicsGravitation, Cosmology & Astrophysics

Energy spectrum

10.1103/physrevlett.126.201102

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Citations (123)