TY - JOUR
T1 - Conjugate Observation of Magnetospheric Chorus Propagating to the Ionosphere by Ducting
AU - Shen, Yangyang
AU - Chen, Lunjin
AU - Zhang, Xiao Jia
AU - Artemyev, Anton
AU - Angelopoulos, Vassilis
AU - Cully, Christopher M.
AU - James, H. Gordon
AU - Yau, Andrew W.
AU - Howarth, Andrew D.
AU - Bortnik, Jacob
AU - Wu, Jiashu
AU - Tian, Sheng
AU - Hartinger, Michael D.
AU - Connors, Martin
AU - Horne, Richard B.
N1 - Funding Information:
The authors appreciate the Van Allen Probe EMFISIS team for providing wave electric and magnetic field data. In particular, the authors are grateful to George B Hospodarsky and William S. Kurth for verifying our use of EMFISIS data. L. Chen was supported by NASA Grants 80NSSC19K0282 and 80NSSC21K0728. Y. Shen, X.‐J. Zhang, and A. Artemyev were supported by NSF Grant 2026375 and NASA Grant 80NSSC21K0729. The work by the EFW team was conducted under JHU/APL contract 922613 (RBSP‐EFW). The authors acknowledge the support for the e‐POP mission from the European Space Agency Third‐Party Mission Programme, the Canadian Space Agency, and the NSERC Discovery Grants Program (TGPIN‐2014‐06069). ABOVE is a joint Canada Foundation for Innovation and Canadian Space Agency project developed by the University of Calgary. Operations are supported through the Canadian Space Agency's Geospace Observatory program.
Funding Information:
The authors appreciate the Van Allen Probe EMFISIS team for providing wave electric and magnetic field data. In particular, the authors are grateful to George B Hospodarsky and William S. Kurth for verifying our use of EMFISIS data. L. Chen was supported by NASA Grants 80NSSC19K0282 and 80NSSC21K0728. Y. Shen, X.-J. Zhang, and A. Artemyev were supported by NSF Grant 2026375 and NASA Grant 80NSSC21K0729. The work by the EFW team was conducted under JHU/APL contract 922613 (RBSP-EFW). The authors acknowledge the support for the e-POP mission from the European Space Agency Third-Party Mission Programme, the Canadian Space Agency, and the NSERC Discovery Grants Program (TGPIN-2014-06069). ABOVE is a joint Canada Foundation for Innovation and Canadian Space Agency project developed by the University of Calgary. Operations are supported through the Canadian Space Agency's Geospace Observatory program.
Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
PY - 2021/12/16
Y1 - 2021/12/16
N2 - Whistler-mode chorus waves are critical for driving resonant scattering and loss of radiation belt relativistic electrons into the atmosphere. The resonant energies of electrons scattered by chorus waves increase at increasingly higher magnetic latitudes. Propagation of chorus waves to middle and high latitudes is hampered by wave divergence and Landau damping but is promoted otherwise if ducted by density irregularities. Although ducting theories have been proposed since the 1960s, no conjugate observation of ducted chorus propagation from the equatorial magnetosphere to the ionosphere has been observed so far. Here we provide such an observation, for the first time, using conjugate spacecraft measurements. Ducted chorus waves maintain significant wave power upon reaching the ionosphere, which is confirmed by ray-tracing simulations. Our results suggest that ducted chorus waves may be an important driver for relativistic electron precipitation.
AB - Whistler-mode chorus waves are critical for driving resonant scattering and loss of radiation belt relativistic electrons into the atmosphere. The resonant energies of electrons scattered by chorus waves increase at increasingly higher magnetic latitudes. Propagation of chorus waves to middle and high latitudes is hampered by wave divergence and Landau damping but is promoted otherwise if ducted by density irregularities. Although ducting theories have been proposed since the 1960s, no conjugate observation of ducted chorus propagation from the equatorial magnetosphere to the ionosphere has been observed so far. Here we provide such an observation, for the first time, using conjugate spacecraft measurements. Ducted chorus waves maintain significant wave power upon reaching the ionosphere, which is confirmed by ray-tracing simulations. Our results suggest that ducted chorus waves may be an important driver for relativistic electron precipitation.
KW - chorus waves
KW - energetic electron precipitation
KW - ionosphere
KW - magnetospheric physics
KW - wave propagation
KW - wave-particle interaction
UR - http://www.scopus.com/inward/record.url?scp=85121036870&partnerID=8YFLogxK
U2 - 10.1029/2021GL095933
DO - 10.1029/2021GL095933
M3 - Journal Article
AN - SCOPUS:85121036870
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 23
M1 - e2021GL095933
ER -