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Statistical Observations of Proton-Band Electromagnetic Ion Cyclotron Waves in the Outer Magnetosphere: Full Wavevector Determination

Toledo-Redondo, S. (författare)
Department of Electromagnetism and Electronics, University of Murcia, Murcia, Spain; Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France
Lee, J. H. (författare)
The Aerospace Corporation, Los Angeles, CA, USA
Vines, S. K. (författare)
Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
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Albert, I. F. (författare)
Department of Electromagnetism and Electronics, University of Murcia, Murcia, Spain
André, M. (författare)
IRF Swedish Institute of Space Physics, Uppsala, Sweden
Castilla, A. (författare)
Department of Electromagnetism and Electronics, University of Murcia, Murcia, Spain
Dargent, J. P. (författare)
Institut für Theoretische Physik, Ruhr-Universität Bochum, Bochum, Germany
Fu, H. S. (författare)
School of Space and Environment, Beihang University, Beijing, China; Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology, Beijing, China
Fuselier, S. A. (författare)
Southwest Research Institute, San Antonio, TX, USA; University of Texas at San Antonio, San Antonio, TX, USA
Genot, V. (författare)
Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France
Graham, D. B. (författare)
IRF Swedish Institute of Space Physics, Uppsala, Sweden
Kitamura, N. (författare)
Institute for Space-Earth Environmental Research (ISEE), Nagoya University, Nagoya, Japan
Khotyaintsev, Yu V. (författare)
IRF Swedish Institute of Space Physics, Uppsala, Sweden
Lavraud, B. (författare)
Laboratoire d'Astrophysique deBordeaux, Bordeaux, France
Montagud-Camps, V. (författare)
Department of Electromagnetism and Electronics, University of Murcia, Murcia, Spain
Navarro, E. A. (författare)
IRTIC Institute/ETSE, Universitat de València, Avd. Universitat, Burjassot, Spain
Norgren, C. (författare)
IRF Swedish Institute of Space Physics, Uppsala, Sweden
Perrone, D. (författare)
ASI—Italian Space Agency, Via del Politecnico snc, Rome, Italy
Phan, T. D. (författare)
SSL, University of California, Berkeley, CA, USA
Portí, J. (författare)
Department of Applied Physics, University of Granada, Granada, Spain
Salinas, A. (författare)
Department of Electromagnetism and Matter Physics, University of Granada, Granada, Spain
Stawarz, J. E. (författare)
Department of Mathematics, Physics, and Electrical Engineering, Northumbria University, Newcastle upon Tyne, UK
Vaivads, Andris (författare)
KTH,Rymd- och plasmafysik,Ventspils University of Applied Sciences, Ventspils, Latvia
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 (creator_code:org_t)
John Wiley and Sons Inc, 2024
2024
Engelska.
Ingår i: Journal of Geophysical Research - Space Physics. - : John Wiley and Sons Inc. - 2169-9380 .- 2169-9402. ; 129:5
Relaterad länk:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Electromagnetic Ion Cyclotron (EMIC) waves mediate energy transfer from the solar wind to the magnetosphere, relativistic electron precipitation, or thermalization of the ring current population, to name a few. How these processes take place depends on the wave properties, such as the wavevector and polarization. However, inferring the wavevector from in-situ measurements is problematic since one needs to disentangle spatial and time variations. Using 8 years of Magnetospheric Multiscale (MMS) mission observations in the dayside magnetosphere, we present an algorithm to detect proton-band EMIC waves in the Earth's dayside magnetosphere, and find that they are present roughly 15% of the time. Their normalized frequency presents a dawn-dusk asymmetry, with waves in the dawn flank magnetosphere having larger frequency than in the dusk, subsolar, and dawn near subsolar region. It is shown that the observations are unstable to the ion cyclotron instability. We obtain the wave polarization and wavevector by comparing Single Value Decomposition and Ampere methods. We observe that for most waves the perpendicular wavenumber (k⊥) is larger than the inverse of the proton gyroradius (ρi), that is, k⊥ρi > 1, while the parallel wavenumber is smaller than the inverse of the ion gyroradius, that is, k‖ρi < 1. Left-hand polarized waves are associated with small wave normal angles (θBk < 30°), while linearly polarized waves are associated with large wave normal angles (θBk > 30°). This work constitutes, to our knowledge, the first attempt to statistically infer the full wavevector of proton-band EMIC waves observed in the outer magnetosphere.

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Nyckelord

ion cylotron waves
magnetosphere
plasma waves

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