@article{14a638915fcf403db375e1d630f76b9c,
title = "Energy Transfer Between Hot Protons and Electromagnetic Ion Cyclotron Waves in Compressional Pc5 Ultra-low Frequency Waves",
abstract = "The Magnetospheric Multiscale (MMS) spacecraft observed many enhancements of electromagnetic ion cyclotron (EMIC) waves in an event in the late afternoon outer magnetosphere. These enhancements occurred mainly in the troughs of magnetic field intensity associated with a compressional ultralow frequency (ULF) wave. The ULF wave had a period of ∼2–5 min (Pc5 frequency range) and was almost static in the plasma rest frame. The magnetic and ion pressures were in antiphase. They are consistent with mirror-mode type structures. We apply the Wave-Particle Interaction Analyzer method, which can quantitatively investigate the energy transfer between hot anisotropic protons and EMIC waves, to burst-mode data obtained by the four MMS spacecraft. The energy transfer near the cyclotron resonance velocity was identified in the vicinity of the center of troughs of magnetic field intensity, which corresponds to the maxima of ion pressure in the compressional ULF wave. This result is consistent with the idea that the EMIC wave generation is modulated by ULF waves, and preferential locations for the cyclotron resonant energy transfer are the troughs of magnetic field intensity. In these troughs, relatively low resonance velocity due to the lower magnetic field intensity and the enhanced hot proton flux likely contribute to the enhanced energy transfer from hot protons to the EMIC waves by cyclotron resonance. Due to the compressional ULF wave, regions of the cyclotron resonant energy transfer can be narrow (only a few times of the gyroradii of hot resonant protons) in magnetic local time.",
keywords = "EMIC wave, MMS spacecraft, ULF wave, mirror mode, wave-particle interaction",
author = "N. Kitamura and M. Shoji and S. Nakamura and M. Kitahara and T. Amano and Y. Omura and H. Hasegawa and Boardsen, {S. A.} and Y. Miyoshi and Y. Katoh and M. Teramoto and Y. Saito and S. Yokota and M. Hirahara and Gershman, {D. J.} and Giles, {B. L.} and Russell, {C. T.} and Strangeway, {R. J.} and N. Ahmadi and Lindqvist, {P. A.} and Ergun, {R. E.} and Fuselier, {S. A.} and Burch, {J. L.}",
note = "Funding Information: This research was supported by the National Aeronautics and Space Administration (NASA) Magnetospheric Multiscale Mission (MMS) in association with NASA contract NNG04EB99 C. The authors thank the entire MMS team and instrument leads for data access and support. The authors acknowledge C. J. Pollock, W. R. Paterson, J.‐A. Sauvaud, V. N. Coffey, J. C. Dorelli, L. A. Avanov, B. Lavraud, M. O. Chandler, A. C. Barrie, and C. Schiff for their valuable roles in providing instrumentation and data production/quality of Fast Plasma Investigation. Institut de Recherche en Astrophysique et Plan{\'e}tologie (IRAP) contributions to MMS FPI was supported by Centre National d'{\'E}tudes Spatiales (CNES) and Centre National de la Recherche Scientifique (CNRS). The authors acknowledge R. B. Torbert for the use of electric field data and the selection of the burst data. This research was supported by Grants‐in‐Aid for Scientific Research (17H06140, 20H01959) of Japan Society for the Promotion of Science (JSPS). The authors gratefully acknowledge Eric Grimes and the development team of the Space Physics Environment Data Analysis System (SPEDAS) software (Angelopoulos et al., 2019 ) for their fruitful efforts in providing this software for our use. The authors thank J. King and N. Papitashvili of the National Space Science Data Center (NSSDC) in the NASA/GSFC for the use of the OMNI 2 data set (OMNI data from http://omniweb.gsfc.nasa.gov/ ). Funding Information: This research was supported by the National Aeronautics and Space Administration (NASA) Magnetospheric Multiscale Mission (MMS) in association with NASA contract NNG04EB99?C. The authors thank the entire MMS team and instrument leads for data access and support. The authors acknowledge C. J. Pollock, W. R. Paterson, J.-A. Sauvaud, V. N. Coffey, J. C. Dorelli, L. A. Avanov, B. Lavraud, M. O. Chandler, A. C. Barrie, and C. Schiff for their valuable roles in providing instrumentation and data production/quality of Fast Plasma Investigation. Institut de Recherche en Astrophysique et Plan?tologie (IRAP) contributions to MMS FPI was supported by Centre National d'?tudes Spatiales (CNES) and Centre National de la Recherche Scientifique (CNRS). The authors acknowledge R. B. Torbert for the use of electric field data and the selection of the burst data. This research was supported by Grants-in-Aid for Scientific Research (17H06140, 20H01959) of Japan Society for the Promotion of Science (JSPS). The authors gratefully acknowledge Eric Grimes and the development team of the Space Physics Environment Data Analysis System (SPEDAS) software (Angelopoulos et?al.,?2019) for their fruitful efforts in providing this software for our use. The authors thank J. King and N. Papitashvili of the National Space Science Data Center (NSSDC) in the NASA/GSFC for the use of the OMNI 2 data set (OMNI data from http://omniweb.gsfc.nasa.gov/). Publisher Copyright: {\textcopyright} 2021. American Geophysical Union. All Rights Reserved.",
year = "2021",
month = may,
doi = "10.1029/2020JA028912",
language = "English",
volume = "126",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
number = "5",
}