TY - JOUR
T1 - Fine Structure of Chorus Wave Packets
T2 - Comparison Between Observations and Wave Generation Models
AU - Zhang, X. J.
AU - Demekhov, A. G.
AU - Katoh, Y.
AU - Nunn, D.
AU - Tao, X.
AU - Mourenas, D.
AU - Omura, Y.
AU - Artemyev, A. V.
AU - Angelopoulos, V.
N1 - Funding Information:
The work of X.‐J. Zhang and A. V. Artemyev was supported by the NSF grants 2021749, 2026375, and NASA grant 80NSSC20K1578. A. Demekhov was supported by the Russian Science Foundation under grant no. 21‐12‐00416. Y. Katoh was supported by Grants‐in‐Aid for Scientific Research (15H05747, 18H03727, 20H01959, and 20K04052) and Y. Omura was supported by 17H06140 of Japan Society for the Promotion of Science. X.‐J. Zhang, A. V. Artemyev, and V. Artemyev acknowledge NASA contract NAS5‐02099 for use of data from the THEMIS Mission, specifically J. W. Bonnell and F. S. Mozer for use of EFI data, O. LeContel and the late A. Roux for use of SCM data, and K. H. Glassmeier, U. Auster and W. Baumjohann for use of FGM data provided under the lead of the Technical University of Braunschweig and with financial support through the German Ministry for Economy and Technology and the German Center for Aviation and Space under contract 50 OC 0302.
Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
PY - 2021/8
Y1 - 2021/8
N2 - Intense lower band chorus waves are ubiquitous in the inner magnetosphere. Their properties have been modeled by various codes and investigated using measurements of many spacecraft missions. This study aims to compare simulated and observed properties of chorus waves. We present detailed comparisons between results from four different codes of nonlinear chorus wave generation and statistical observations from satellites, focusing on the fine structure of such chorus waves. We show that simulations performed with these different codes well reproduce the observed wave packet characteristics, although in somewhat complementary parameter domains as concerns wave packets sizes, amplitudes, and frequency sweep rates. In particular, simulations generate both the frequently observed short wave packets with high positive and negative frequency sweep rates, and the more rare long and intense packets with mainly rising tones. Moreover, simulations reproduce quantitatively both the increase of the size of the observed chorus wave packets with their peak amplitude, and the fast decrease of their frequency sweep rate as their size increases. This confirms the reliability of the main existing codes for accurately modeling chorus wave generation, although we find that initial conditions should be carefully selected to reproduce a given parameter range.
AB - Intense lower band chorus waves are ubiquitous in the inner magnetosphere. Their properties have been modeled by various codes and investigated using measurements of many spacecraft missions. This study aims to compare simulated and observed properties of chorus waves. We present detailed comparisons between results from four different codes of nonlinear chorus wave generation and statistical observations from satellites, focusing on the fine structure of such chorus waves. We show that simulations performed with these different codes well reproduce the observed wave packet characteristics, although in somewhat complementary parameter domains as concerns wave packets sizes, amplitudes, and frequency sweep rates. In particular, simulations generate both the frequently observed short wave packets with high positive and negative frequency sweep rates, and the more rare long and intense packets with mainly rising tones. Moreover, simulations reproduce quantitatively both the increase of the size of the observed chorus wave packets with their peak amplitude, and the fast decrease of their frequency sweep rate as their size increases. This confirms the reliability of the main existing codes for accurately modeling chorus wave generation, although we find that initial conditions should be carefully selected to reproduce a given parameter range.
KW - chorus wave packets
KW - data model comparison
KW - frequency sweep rates
KW - nonlinear generation models
KW - Van Allen Probes
KW - wave packet size
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U2 - 10.1029/2021JA029330
DO - 10.1029/2021JA029330
M3 - Article
AN - SCOPUS:85112095173
VL - 126
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
SN - 2169-9380
IS - 8
M1 - e2021JA029330
ER -