Observation of a Large-Amplitude Slow Magnetosonic Wave in the Magnetosheath

Zhao S. Q.; Xiao C. J.; Wang X. G.Pu Z. Y.Shi M. J.Liu T. Z.

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Observation of a Large-Amplitude Slow Magnetosonic Wave in the Magnetosheath

机译：Observation of a Large-Amplitude Slow Magnetosonic Wave in the Magnetosheath

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abstract_textpUsing the Magnetospheric Multiscale spacecraft, we report observations of the pressure-balanced structures in the form of slow magnetosonic waves rather than the mirror mode description in the Earth's magnetosheath. The slow magnetosonic waves are identified with three criteria: (1) The significant inverse correlation coefficients between the plasma thermal pressure (P-plasma) and the magnetic pressure (P-mag) with the constant total pressure (P-tot = P-plasma+P-mag); (2) the wave frequency Doppler shifted to the plasma flow frame is not zero to within the measurement error, which distinguishes the slow magnetosonic mode from the mirror mode; and (3) the observational dispersion relation is in a reasonable agreement with the linear theoretical result of slow magnetosonic waves. We find that slow magnetosonic waves can propagate over many wavelengths with negligible decay due to their transverse propagation which dramatically decreases their kinetic damping rate. Furthermore, we propose a possible generation mechanism that a high-speed ion beam resonates with the local ion acoustic mode contributing to the inverse Landau damping process that converts particle energy into waves./p/abstract_text

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《Journal of geophysical research》 |2019年第12期|10200-10208|共9页
作者
Zhao S. Q.; Xiao C. J.; Wang X. G.Pu Z. Y.Shi M. J.Liu T. Z.;
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Peking Univ, Fus Simulat Ctr, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China;

Harbin Inst Technol, Dept Phys, Lab Space Environm & Phys Sci, Harbin, Heilongjiang, Peoples R China;

Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R ChinaUniv Alaska, Geophys Inst, Fairbanks, AK 99701 USAShandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R ChinaUniv Corp Atmospher Res, Cooperat Programs Adv Earth Syst Sci, Boulder, CO USA;

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Slow magnetosonic waves; dispersion relation; Earth's magnetosheath; EARTHS MAGNETOSHEATH; FIELD;

Observation of a Large-Amplitude Slow Magnetosonic Wave in the Magnetosheath

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