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Energetic Electron Precipitation Driven by Electromagnetic Ion Cyclotron Waves from ELFIN's Low Altitude Perspective.
Angelopoulos, V; Zhang, X-J; Artemyev, A V; Mourenas, D; Tsai, E; Wilkins, C; Runov, A; Liu, J; Turner, D L; Li, W; Khurana, K; Wirz, R E; Sergeev, V A; Meng, X; Wu, J; Hartinger, M D; Raita, T; Shen, Y; An, X; Shi, X; Bashir, M F; Shen, X; Gan, L; Qin, M; Capannolo, L; Ma, Q; Russell, C L; Masongsong, E V; Caron, R; He, I; Iglesias, L; Jha, S; King, J; Kumar, S; Le, K; Mao, J; McDermott, A; Nguyen, K; Norris, A; Palla, A; Roosnovo, A; Tam, J; Xie, E; Yap, R C; Ye, S; Young, C; Adair, L A; Shaffer, C; Chung, M; Cruce, P.
Afiliação
  • Angelopoulos V; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Zhang XJ; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Artemyev AV; Present Address: University of Texas at Dallas, Richardson, TX 75080 USA.
  • Mourenas D; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Tsai E; CEA, DAM, DIF, Arpajon, France.
  • Wilkins C; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Runov A; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Liu J; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Turner DL; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Li W; Atmospheric and Oceanic Sciences Departments, University of California, Los Angeles, CA USA.
  • Khurana K; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Wirz RE; Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland USA.
  • Sergeev VA; Atmospheric and Oceanic Sciences Departments, University of California, Los Angeles, CA USA.
  • Meng X; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Wu J; Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA.
  • Hartinger MD; Present Address: School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331 USA.
  • Raita T; University of St. Petersburg, St. Petersburg, Russia.
  • Shen Y; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.
  • An X; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Shi X; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Bashir MF; Space Science Institute, Boulder, CO 80301 USA.
  • Shen X; Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland.
  • Gan L; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Qin M; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Capannolo L; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Ma Q; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Russell CL; Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA.
  • Masongsong EV; Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA.
  • Caron R; Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA.
  • He I; Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA.
  • Iglesias L; Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA.
  • Jha S; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • King J; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Kumar S; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Le K; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Mao J; Materials Science and Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA.
  • McDermott A; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Nguyen K; Present Address: Deloitte Consulting, New York, NY 10112 USA.
  • Norris A; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Palla A; Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA.
  • Roosnovo A; Present Address: Microsoft, Redmond, WA 98052 USA.
  • Tam J; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Xie E; Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA.
  • Yap RC; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Ye S; Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA.
  • Young C; Present Address: Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637 USA.
  • Adair LA; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Shaffer C; Materials Science and Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA.
  • Chung M; Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA.
  • Cruce P; Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA.
Space Sci Rev ; 219(5): 37, 2023.
Article em En | MEDLINE | ID: mdl-37448777
We review comprehensive observations of electromagnetic ion cyclotron (EMIC) wave-driven energetic electron precipitation using data collected by the energetic electron detector on the Electron Losses and Fields InvestigatioN (ELFIN) mission, two polar-orbiting low-altitude spinning CubeSats, measuring 50-5000 keV electrons with good pitch-angle and energy resolution. EMIC wave-driven precipitation exhibits a distinct signature in energy-spectrograms of the precipitating-to-trapped flux ratio: peaks at >0.5 MeV which are abrupt (bursty) (lasting ∼17 s, or ΔL∼0.56) with significant substructure (occasionally down to sub-second timescale). We attribute the bursty nature of the precipitation to the spatial extent and structuredness of the wave field at the equator. Multiple ELFIN passes over the same MLT sector allow us to study the spatial and temporal evolution of the EMIC wave - electron interaction region. Case studies employing conjugate ground-based or equatorial observations of the EMIC waves reveal that the energy of moderate and strong precipitation at ELFIN approximately agrees with theoretical expectations for cyclotron resonant interactions in a cold plasma. Using multiple years of ELFIN data uniformly distributed in local time, we assemble a statistical database of ∼50 events of strong EMIC wave-driven precipitation. Most reside at L∼5-7 at dusk, while a smaller subset exists at L∼8-12 at post-midnight. The energies of the peak-precipitation ratio and of the half-peak precipitation ratio (our proxy for the minimum resonance energy) exhibit an L-shell dependence in good agreement with theoretical estimates based on prior statistical observations of EMIC wave power spectra. The precipitation ratio's spectral shape for the most intense events has an exponential falloff away from the peak (i.e., on either side of ∼1.45 MeV). It too agrees well with quasi-linear diffusion theory based on prior statistics of wave spectra. It should be noted though that this diffusive treatment likely includes effects from nonlinear resonant interactions (especially at high energies) and nonresonant effects from sharp wave packet edges (at low energies). Sub-MeV electron precipitation observed concurrently with strong EMIC wave-driven >1 MeV precipitation has a spectral shape that is consistent with efficient pitch-angle scattering down to ∼ 200-300 keV by much less intense higher frequency EMIC waves at dusk (where such waves are most frequent). At ∼100 keV, whistler-mode chorus may be implicated in concurrent precipitation. These results confirm the critical role of EMIC waves in driving relativistic electron losses. Nonlinear effects may abound and require further investigation.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Space Sci Rev Ano de publicação: 2023 Tipo de documento: Article
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Space Sci Rev Ano de publicação: 2023 Tipo de documento: Article