Contribution of energetic and heavy ions to the plasma pressure: The 27 September to 3 October 2002 storm

Kronberg, Elena A.; Welling, D. T.; Kistler, L. M.; Mouikis, C.; Daly, P. W.; Григоренко, Е. Е.; Klecker, B.; Dandouras, I.

doi:10.1002/2017ja024215

Cited by 17 publications

(19 citation statements)

References 83 publications

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“…On one side Catapano et al () using test particle simulations have modeled the acceleration of ions by stochastic electromagnetic turbulence in the terrestrial magnetotail and found that the most effectively accelerated ion is He ++ , compared to protons and O + which are accelerated with equal efficiency. Conversely, in observations of the terrestrial magnetotail the effectiveness of the ion energization is the strongest for the oxygen and the weakest for the protons (Kronberg et al, ). However, in observations multiple effects such as dipolarizations and turbulence are present, and therefore, it is important to separate them.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of Ions in Jovian Plasmoids: Does Turbulence Play a Role?

et al. 2019

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The dissipation processes which transform electromagnetic energy into kinetic particle energy in space plasmas are still not fully understood. Of particular interest is the distribution of the dissipated energy among different species of charged particles. The Jovian magnetosphere is a unique laboratory to study this question because outflowing ions from the moon Io create a high diversity in ion species. In this work, we use multispecies ion observations and magnetic field measurements by the Galileo spacecraft. We limit our study to observations of plasmoids in the Jovian magnetotail, because there is strong ion acceleration in these structures. Our model predicts that electromagnetic turbulence in plasmoids plays an essential role in the acceleration of oxygen, sulfur, and hydrogen ions. The observations show a decrease of the oxygen and sulfur energy spectral index γ at ∼30 to ∼400 keV/nuc with the wave power indicating an energy transfer from electromagnetic waves to particles, in agreement with the model. The wave power threshold for effective acceleration is of the order of 10 nT2Hz−1, as in terrestrial plasmoids. However, this is not observed for hydrogen ions, implying that processes other than wave‐particle interaction are more important for the acceleration of these ions or that the time and energy resolution of the observations is too coarse. The results are expected to be confirmed by improved plasma measurements by the Juno spacecraft.

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Section: Introductionmentioning

confidence: 99%

Acceleration of Ions in Jovian Plasmoids: Does Turbulence Play a Role?

et al. 2019

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“…It is observationally known that~10-100 keV ions are the main components of the storm time ring current (e.g., Daglis et al, 1999;Kronberg et al, 2017) and that they are supplied into the ring current by convective transport (e.g., Gkioulidou et al, 2016). The mechanisms of the ion transport differ depending on the ion energy, charge, mass, or source.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanisms of the ion transport differ depending on the ion energy, charge, mass, or source. It is observationally known that~10-100 keV ions are the main components of the storm time ring current (e.g., Daglis et al, 1999;Kronberg et al, 2017) and that they are supplied into the ring current by convective transport (e.g., Gkioulidou et al, 2016). Keika et al (2018) reported that 100-300 keV protons made the dominant contribution to the energy density during the late main phase of the unexpectedly intensified storm on 17 March 2015.…”

Section: Introductionmentioning

confidence: 99%

Radial Transport of Higher‐Energy Oxygen Ions Into the Deep Inner Magnetosphere Observed by Van Allen Probes

Mitani

Seki

Keika

et al. 2018

Geophysical Research Letters

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The transport mechanism of the ring current ions differs among ion energies. Lower‐energy (≲150 keV) ions are well known to be transported convectively. Higher‐energy (≳150 keV) protons are reported to be transported diffusively, while there are few reports about transport of higher‐energy oxygen ions. We report the radial transport of higher‐energy oxygen ions into the deep inner magnetosphere during the late main phase of the magnetic storm on 23–25 April 2013 observed by the Van Allen Probes spacecraft. An enhancement of 1–100 mHz magnetic fluctuations is simultaneously observed. Observations of 3 and 30 mHz geomagnetic pulsations indicate the azimuthal mode number is ≤10. The fluctuations can resonate with the drift and bounce motions of the oxygen ions. The results suggest that the combination of the drift and drift‐bounce resonances is responsible for the radial transport of higher‐energy oxygen ions.

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“…The increase of plasma pressure in the inner magnetosphere due to ion transport from the plasma sheet is the main cause of the development of the westward ring current in the magnetosphere. The energy content of the storm time ring current is dominated by <150-keV ions (Daglis et al, 1999;Kronberg et al, 2017). The major ion species of the ring current ions are proton and oxygen ions (e.g., Gloeckler & Hamilton, 1987).…”

Section: Introductionmentioning

confidence: 99%

Statistical Study of Selective Oxygen Increase in High‐Energy Ring Current Ions During Magnetic Storms

et al. 2019

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Ion transport from the plasma sheet to the ring current is the main cause of the development of the ring current. Energetic (>150 keV) ring current ions are known to be transported diffusively in several days. A recent study suggested that energetic oxygen ions are transported closer to the Earth than protons due to the diffusive transport caused by a combination of the drift and drift‐bounce resonances with Pc 3–5 ultralow frequency waves during the 24 April 2013 magnetic storm. To understand the occurrence conditions of such selective oxygen increase (SOI), we investigate the phase space densities (PSDs) between protons and oxygen ions with the first adiabatic invariants (μ) of 0.1–2.0 keV/nT measured by the Radiation Belt Storm Probes Ion Composition Experiment instrument on the Van Allen Probes at L ~ 3–6 during 90 magnetic storms in 2013–2017. We identified the SOI events in which oxygen PSDs increase while proton PSDs do not increase during a period of ~9 hr (one orbital period). Among the 90 magnetic storms, 33% were accompanied by the SOI events. Global enhancements of Pc 4 and Pc 5 waves observed by ground magnetometers during the SOI events suggest that radial transport due to combination of the drift‐bounce resonance with Pc 4 oscillations and the drift resonance with Pc 5 oscillations can be the cause of SOIs. The contribution of the SOI events to the magnetic storm intensity is roughly estimated to be ~9% on average.

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Contribution of energetic and heavy ions to the plasma pressure: The 27 September to 3 October 2002 storm

Cited by 17 publications

References 83 publications

Acceleration of Ions in Jovian Plasmoids: Does Turbulence Play a Role?

Acceleration of Ions in Jovian Plasmoids: Does Turbulence Play a Role?

Radial Transport of Higher‐Energy Oxygen Ions Into the Deep Inner Magnetosphere Observed by Van Allen Probes

Statistical Study of Selective Oxygen Increase in High‐Energy Ring Current Ions During Magnetic Storms

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