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Origin of two-band chorus in the radiation belt of Earth

Journal Article · · Nature Communications
 [1];  [2];  [2];  [3];  [4];  [2];  [5];  [6];  [7];  [8];  [9];  [9];  [10];  [11];  [12]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences; DOE/OSTI
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
  3. Boston Univ., MA (United States). Center for Space Physics
  4. Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Space and Planetary Sciences
  5. Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Space and Planetary Sciences
  6. Wuhan Univ. (China). Dept. of Space Physics, School of Electronic Information; CAS Center for Excellence in Comparative Planetology, Anhui (China)
  7. Boston Univ., MA (United States). Center for Space Physics
  8. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  9. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  10. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  11. Univ. of New Hampshire, Durham, NH (United States). Institute for the Study of Earth, Oceans, and Space
  12. Univ. of Colorado, Boulder, CO (United States). Laboratory for Atmospheric and Space Physics
+ Show Author Affiliations
Naturally occurring chorus emissions are a class of electromagnetic waves found in the space environments of the Earth and other magnetized planets. They play an essential role in accelerating high-energy electrons forming the hazardous radiation belt environment. Chorus typically occurs in two distinct frequency bands separated by a gap. The origin of this two-band structure remains a 50-year old question. Here we report, using NASA’s Van Allen Probe measurements, that banded chorus waves are commonly accompanied by two separate anisotropic electron components. Using numerical simulations, we show that the initially excited single-band chorus waves alter the electron distribution immediately via Landau resonance, and suppress the electron anisotropy at medium energies. This naturally divides the electron anisotropy into a low and a high energy components which excite the upper-band and lower-band chorus waves, respectively. This mechanism may also apply to the generation of chorus waves in other magnetized planetary magnetospheres.
Research Organization:
Univ. of California, Los Angeles, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC); NASA
Grant/Contract Number:
SC0010578; 89233218CNA000001
OSTI ID:
1624199
Alternate ID(s):
OSTI ID: 1804387
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Magnetically confined plasmas
Magnetospheric physics