Výsledky vyhledávání - "Geoffrey D. Reeves"

Akademický článek

The Densities and Compositions of Background Cold Ions Based on the Van Allen Probe Observations

Autor: Chao Yue, Yuxuan Li, Lynn Kistler, Qianli Ma, Haobo Fu, Geoffrey D. Reeves, Xuzhi Zhou, Qiugang Zong, Harlan E. Spence

Publikováno v: Geophysical Research Letters, Vol 50, Iss 15, Pp n/a-n/a (2023)

Abstract The cold ions, which are generally “invisible” to most instruments, have strong impacts on plasma wave and magnetic reconnection. Under particular situations, these cold ions could be accelerated and thus become detectable. In this study

Externí odkaz: https://doaj.org/article/61201846050440c28c34a72e98899c30

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Akademický článek

Testing the key processes that accelerate outer radiation belt relativistic electrons during geomagnetic storms

Autor: Man Hua, Jacob Bortnik, Harlan E. Spence, Geoffrey D. Reeves

Publikováno v: Frontiers in Astronomy and Space Sciences, Vol 10 (2023)

Since the discovery of the Earth’s radiation belts in 1958, it has always been a challenge to determine the dominant physical mechanisms, whether local acceleration by chorus or inward radial diffusion, that leads to outer radiation belt relativist

Externí odkaz: https://doaj.org/article/216c72c51f6f47dcae4479e40518ad7b

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Akademický článek

Very-Low-Frequency transmitters bifurcate energetic electron belt in near-earth space

Autor: Man Hua, Wen Li, Binbin Ni, Qianli Ma, Alex Green, Xiaochen Shen, Seth G. Claudepierre, Jacob Bortnik, Xudong Gu, Song Fu, Zheng Xiang, Geoffrey D. Reeves

Publikováno v: Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020)

Very-Low-Frequency (VLF) communication transmitters, operate worldwide, radiate emissions at particular frequencies 10-30 kHz. Here, the authors show VLF transmitter emissions that leak from the Earth’s ground are primarily responsible for bifurcat

Externí odkaz: https://doaj.org/article/2c17d11569934829ad0e48519c3d1c7e

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Akademický článek

The Beam Plasma Interactions Experiment: An Active Experiment Using Pulsed Electron Beams

Autor: Geoffrey D. Reeves, Gian Luca Delzanno, Philip A. Fernandes, Kateryna Yakymenko, Bruce E. Carlsten, John W. Lewellen, Michael A. Holloway, Dinh C. Nguyen, Robert F. Pfaff, William M. Farrell, Douglas E. Rowland, Marilia Samara, Ennio R. Sanchez, Emma Spanswick, Eric F. Donovan, Vadim Roytershteyn

Publikováno v: Frontiers in Astronomy and Space Sciences, Vol 7 (2020)

The 1970s and 1980s were heydays for using active electron beam experiments to probe some of the fundamental physical processes that occur throughout the heliosphere and in astrophysical contexts. Electron beam experiments were used to study spacecra

Externí odkaz: https://doaj.org/article/7541dafdb1bd42c68c1e576a0f7fd51e

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The growth of ring current/SYM-H under northward IMF Bz conditions present during the 21-22 January 2005 geomagnetic storm

Autor: Diptiranjan Rout, Swadesh Patra, Sandeep Kumar, Dibyendu Chakrabarty, Geoffrey D. Reeves, Claudia Stolle, Kuldeep Pandey, Shibaji Chakraborty, Edmund A. Spencer

Publikováno v: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

The Magnetosphere-Ionosphere (MI) system is primarily driven by solar wind dynamics. The energy transfer from the solar wind to the Earth’s magnetosphere is most efficient under southward IMF Bz conditions. Generally, the southward IMF Bz drives th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7408fa8f481aca688f9c939de3a4fece
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017388

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A Neural Network-Based Model of the Relativistic Electrons Fluxes in the Outer Radiation Belt

Autor: Xiangning Chu, Donglai Ma, Jacob Bortnik, W Kent Tobiska, Alfredo Cruz, S. Dave Bouwer, Hong Zhao, Qianli Ma, Kun Zhang, Daniel N. Baker, Xinlin Li, Harlan Spence, Geoffrey D Reeves

We present a machine-learning-based model of relativistic electron fluxes >1.8 MeV using a neural network approach in the Earth's outer radiation belt. The Outer RadIation belt Electron Neural net model for Relativistic electrons (ORIENT-R) uses only

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a6092cf3e69cdf5be8c84d2fbcc8d42f
https://doi.org/10.5194/egusphere-egu22-6611

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