Diagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels

M. D. Hartinger; S. G. Claudepierre; D. L. Turner; G. D. Reeves; A. Breneman; I. R. Mann; T. Peek; E. Chang; J. B. Blake; J. F. Fennell; T. P. O'Brien; M. D. Looper

doi:10.1029/2018GL080291

Diagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels

M. D. Hartinger, S. G. Claudepierre, D. L. Turner, G. D. Reeves, A. Breneman, I. R. Mann, T. Peek, E. Chang, J. B. Blake, J. F. Fennell, T. P. O'Brien, M. D. Looper

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Electron flux measurements are an important diagnostic for interactions between ultralow-frequency (ULF) waves and relativistic (∼1 MeV) electrons. Since measurements are collected by particle detectors with finite energy channel width, they are affected by a phase mixing process that can obscure these interactions. We demonstrate that ultrahigh-resolution electron measurements from the Magnetic Electron Ion Spectrometer on the Van Allen Probes mission—obtained using a data product that improves the energy resolution by roughly an order of magnitude—are crucial for understanding ULF wave-particle interactions. In particular, the ultrahigh-resolution measurements reveal a range of complex dynamics that cannot be resolved by standard measurements. Furthermore, the standard measurements provide estimates for the ULF flux modulation amplitude, period, and phase that may not be representative of true flux modulations, potentially leading to ambiguous conclusions concerning electron dynamics.

Original language	English (US)
Pages (from-to)	10,883-10,892
Journal	Geophysical Research Letters
Volume	45
Issue number	20
DOIs	https://doi.org/10.1029/2018GL080291
State	Published - Oct 28 2018

Bibliographical note

Funding Information:
M. D. H. was supported by NASA NNX17AI53G and LANL-CSES. Work at The Aerospace Corporation was supported by RBSPECT funding provided by JHU/APL contract 967399 under NASA’s Prime contract NAS5-01072, and MagEIS processing and analysis was generally funded under NASA’s Prime contract NAS5-01072. The work by the EFW team was conducted under JHU/APL contract 922613 (RBSP-EFW). I. R. M. is supported by a Discovery Grant from Canadian NSERC. We acknowledge the NASA Van Allen Probes and Craig Kletzing for use of EMFISIS data. We acknowledge the NASA Space Science Data facility providing the solar wind, geomagnetic activity indices, and most RBSP satellite measurements used in this study. With the exception of ultrahigh-resolution electron fluxes, all data are publicly available using either the OMNIWeb interface (http:// omniweb.gsfc.nasa.gov for solar wind and geomagnetic activity indices) or CDAWeb interface (https:// cdaweb.sci.gsfc.nasa.gov/index. html/ for RBSP measurements). The ultrahigh-resolution electron fluxes are provided in the supporting information. SPEDAS software for plotting can be obtained from the THEMIS website (http://themis.ssl. berkeley.edu/index.shtml).

Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.

Keywords

Pc5
ULF wave
drift resonance
particle detector
radiation belts
wave-particle interaction

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Hartinger, M. D., Claudepierre, S. G., Turner, D. L., Reeves, G. D., Breneman, A., Mann, I. R., Peek, T., Chang, E., Blake, J. B., Fennell, J. F., O'Brien, T. P., & Looper, M. D. (2018). Diagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels. Geophysical Research Letters, 45(20), 10,883-10,892. https://doi.org/10.1029/2018GL080291

Hartinger, MD, Claudepierre, SG, Turner, DL, Reeves, GD, Breneman, A, Mann, IR, Peek, T, Chang, E, Blake, JB, Fennell, JF, O'Brien, TP & Looper, MD 2018, 'Diagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels', Geophysical Research Letters, vol. 45, no. 20, pp. 10,883-10,892. https://doi.org/10.1029/2018GL080291

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abstract = "Electron flux measurements are an important diagnostic for interactions between ultralow-frequency (ULF) waves and relativistic (∼1 MeV) electrons. Since measurements are collected by particle detectors with finite energy channel width, they are affected by a phase mixing process that can obscure these interactions. We demonstrate that ultrahigh-resolution electron measurements from the Magnetic Electron Ion Spectrometer on the Van Allen Probes mission—obtained using a data product that improves the energy resolution by roughly an order of magnitude—are crucial for understanding ULF wave-particle interactions. In particular, the ultrahigh-resolution measurements reveal a range of complex dynamics that cannot be resolved by standard measurements. Furthermore, the standard measurements provide estimates for the ULF flux modulation amplitude, period, and phase that may not be representative of true flux modulations, potentially leading to ambiguous conclusions concerning electron dynamics.",

keywords = "Pc5, ULF wave, drift resonance, particle detector, radiation belts, wave-particle interaction",

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note = "Funding Information: M. D. H. was supported by NASA NNX17AI53G and LANL-CSES. Work at The Aerospace Corporation was supported by RBSPECT funding provided by JHU/APL contract 967399 under NASA{\textquoteright}s Prime contract NAS5-01072, and MagEIS processing and analysis was generally funded under NASA{\textquoteright}s Prime contract NAS5-01072. The work by the EFW team was conducted under JHU/APL contract 922613 (RBSP-EFW). I. R. M. is supported by a Discovery Grant from Canadian NSERC. We acknowledge the NASA Van Allen Probes and Craig Kletzing for use of EMFISIS data. We acknowledge the NASA Space Science Data facility providing the solar wind, geomagnetic activity indices, and most RBSP satellite measurements used in this study. With the exception of ultrahigh-resolution electron fluxes, all data are publicly available using either the OMNIWeb interface (http:// omniweb.gsfc.nasa.gov for solar wind and geomagnetic activity indices) or CDAWeb interface (https:// cdaweb.sci.gsfc.nasa.gov/index. html/ for RBSP measurements). The ultrahigh-resolution electron fluxes are provided in the supporting information. SPEDAS software for plotting can be obtained from the THEMIS website (http://themis.ssl. berkeley.edu/index.shtml). Publisher Copyright: {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",

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AU - Chang, E.

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AU - Looper, M. D.

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N2 - Electron flux measurements are an important diagnostic for interactions between ultralow-frequency (ULF) waves and relativistic (∼1 MeV) electrons. Since measurements are collected by particle detectors with finite energy channel width, they are affected by a phase mixing process that can obscure these interactions. We demonstrate that ultrahigh-resolution electron measurements from the Magnetic Electron Ion Spectrometer on the Van Allen Probes mission—obtained using a data product that improves the energy resolution by roughly an order of magnitude—are crucial for understanding ULF wave-particle interactions. In particular, the ultrahigh-resolution measurements reveal a range of complex dynamics that cannot be resolved by standard measurements. Furthermore, the standard measurements provide estimates for the ULF flux modulation amplitude, period, and phase that may not be representative of true flux modulations, potentially leading to ambiguous conclusions concerning electron dynamics.

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Diagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels

Abstract

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Keywords

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