Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves
Abstract
Abstract Suprathermal electrons (~0.1–10 keV) in the inner magnetosphere are usually observed in a 90°‐peaked pitch angle distribution, formed due to the conservation of the first and second adiabatic invariants as they are transported from the plasma sheet. We report a peculiar field‐aligned suprathermal electron (FASE) distribution measured by Van Allen Probes, where parallel fluxes are 1 order of magnitude higher than perpendicular fluxes. Those FASEs are found to be closely correlated with large‐amplitude hiss waves and are observed around the Landau resonant energies. We demonstrate, using quasilinear diffusion simulations, that hiss waves can rapidly accelerate suprathermal electrons through Landau resonance and create the observed FASE population. The proposed mechanism potentially has broad implications for suprathermal electron dynamics as well as whistler mode waves in the Earth's magnetosphere and has been demonstrated in the Jovian magnetosphere.
- Authors:
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[1];
[2];
[1];
[3];
[1];
[4];
[5];
[6];
[7];
[8];
[8];
[8]
- Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
- Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA, Center for Space Physics Boston University Boston MA USA
- Center for Space Physics Boston University Boston MA USA
- Space Science and Applications Group, Los Alamos National Laboratory Los Alamos NM USA
- Los Alamos National Laboratory Los Alamos NM USA
- Institute for the Study of Earth, Oceans, and Space University of New Hampshire Durham NH USA
- Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
- Department of Physics and Astronomy University of Iowa Iowa City IA USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1575309
- Grant/Contract Number:
- SC0010578
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 46 Journal Issue: 22; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Li, Jinxing, Ma, Qianli, Bortnik, Jacob, Li, Wen, An, Xin, Reeves, Geoffrey D., Funsten, Herbert O., Spence, Harlan, Baker, Daniel N., Kurth, William S., Hospodarsky, George B., and Hartley, David P. Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves. United States: N. p., 2019.
Web. doi:10.1029/2019GL085562.
Li, Jinxing, Ma, Qianli, Bortnik, Jacob, Li, Wen, An, Xin, Reeves, Geoffrey D., Funsten, Herbert O., Spence, Harlan, Baker, Daniel N., Kurth, William S., Hospodarsky, George B., & Hartley, David P. Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves. United States. https://doi.org/10.1029/2019GL085562
Li, Jinxing, Ma, Qianli, Bortnik, Jacob, Li, Wen, An, Xin, Reeves, Geoffrey D., Funsten, Herbert O., Spence, Harlan, Baker, Daniel N., Kurth, William S., Hospodarsky, George B., and Hartley, David P. Fri .
"Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves". United States. https://doi.org/10.1029/2019GL085562.
@article{osti_1575309,
title = {Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves},
author = {Li, Jinxing and Ma, Qianli and Bortnik, Jacob and Li, Wen and An, Xin and Reeves, Geoffrey D. and Funsten, Herbert O. and Spence, Harlan and Baker, Daniel N. and Kurth, William S. and Hospodarsky, George B. and Hartley, David P.},
abstractNote = {Abstract Suprathermal electrons (~0.1–10 keV) in the inner magnetosphere are usually observed in a 90°‐peaked pitch angle distribution, formed due to the conservation of the first and second adiabatic invariants as they are transported from the plasma sheet. We report a peculiar field‐aligned suprathermal electron (FASE) distribution measured by Van Allen Probes, where parallel fluxes are 1 order of magnitude higher than perpendicular fluxes. Those FASEs are found to be closely correlated with large‐amplitude hiss waves and are observed around the Landau resonant energies. We demonstrate, using quasilinear diffusion simulations, that hiss waves can rapidly accelerate suprathermal electrons through Landau resonance and create the observed FASE population. The proposed mechanism potentially has broad implications for suprathermal electron dynamics as well as whistler mode waves in the Earth's magnetosphere and has been demonstrated in the Jovian magnetosphere.},
doi = {10.1029/2019GL085562},
journal = {Geophysical Research Letters},
number = 22,
volume = 46,
place = {United States},
year = {Fri Nov 22 00:00:00 EST 2019},
month = {Fri Nov 22 00:00:00 EST 2019}
}
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