Revisit of relationship between geosynchronous relativistic electron enhancements and magnetic storms

Kim, Heejeong; Lyons, L. R.; Pinto, V. A.; Wang, Chih‐Ping; Kim, Kyung-Chan

doi:10.1002/2015gl065192

Cited by 33 publications

(71 citation statements)

References 23 publications

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“…4. Understanding the complex evolution of the outer radiation belt requires to explain in addition why similar geomagnetic storms can produce different levels of global energization or loss, as first noted by Reeves et al (2003) (see also more recent studies by Turner et al 2015;Kim et al 2015). As we show in this review, one likely cause, if not the sole one, can be the observed variability of lower-band chorus wave obliquity with geomagnetic activity.…”

Section: Discussionmentioning

confidence: 88%

“…A correlation between large enhancements of electron flux and D st has been observed at L 3-5.5 in the outer radiation belt (Zhao and Li 2013). However, other recent investigations have shown that D st alone cannot fully characterize the energization of electrons at higher L 6.6: there, AE and K p turn out to be much more discriminating, but solar wind parameters should be taken into account as well (Kim et al 2015). 3.…”

Section: Statistical Models Of Chorus Waves Derived From Satellite Obmentioning

confidence: 93%

“…A long duration auroral activity generated by corotating interaction streams (Tsurutani et al 2006) represents another example of situation where there is no significant D st or K p variations, but electrons may be strongly scattered or accelerated by whistler waves. Thus, one should be careful when using a D st /K p parameterization of wave activity, and compare it with a parameterization based on the AE index (Shprits et al 2007) or solar wind parameters (Aryan et al 2014;Kim et al 2015;Li et al 2015a). …”

Section: Lifetimes Over the Course Of A Stormmentioning

confidence: 99%

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Oblique Whistler-Mode Waves in the Earth’s Inner Magnetosphere: Energy Distribution, Origins, and Role in Radiation Belt Dynamics

et al. 2016

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International audienceIn this paper we review recent spacecraft observations of oblique whistler-mode waves in the Earth’s inner magnetosphere as well as the various consequences of the presence of such waves for electron scattering and acceleration. In particular, we survey the statistics of occurrences and intensity of oblique chorus waves in the region of the outer radiation belt, comprised between the plasmapause and geostationary orbit, and discuss how their actual distribution may be explained by a combination of linear and non-linear generation, propagation, and damping processes. We further examine how such oblique wave populations can be included into both quasi-linear diffusion models and fully nonlinear models of wave-particle interaction. On this basis, we demonstrate that varying amounts of oblique waves can significantly change the rates of particle scattering, acceleration, and precipitation into the atmosphere during quiet times as well as in the course of a storm. Finally, we discuss possible generation mechanisms for such oblique waves in the radiation belts. We demonstrate that oblique whistler-mode chorus waves can be considered as an important ingredient of the radiation belt system and can play a key role in many aspects of wave-particle resonant interactions

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Section: Discussionmentioning

confidence: 88%

Section: Statistical Models Of Chorus Waves Derived From Satellite Obmentioning

confidence: 93%

Section: Lifetimes Over the Course Of A Stormmentioning

confidence: 99%

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Oblique Whistler-Mode Waves in the Earth’s Inner Magnetosphere: Energy Distribution, Origins, and Role in Radiation Belt Dynamics

et al. 2016

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“…Kim et al . [] have shown that relativistic electron enhancements at geosynchronous orbit likely occur independently from geomagnetic storms. Turner et al .…”

Section: Introductionmentioning

confidence: 99%

“…Li et al ., ; Reeves et al ., ; Boynton et al ., ; W . Li et al ., ; Kim et al ., ; Xiong et al ., ; Ni et al ., , ; Yu et al ., , ; Wing et al ., ]. However, these studies mainly discussed relativistic electron fluxes at geosynchronous orbit, which is well beyond the center of the outer radiation belt, and these changes of MeV electron fluxes included both nonadiabatic and adiabatic processes.…”

Section: Introductionmentioning

confidence: 99%

The effects of magnetospheric processes on relativistic electron dynamics in the Earth's outer radiation belt

Tang

Wang

et al. 2017

JGR Space Physics

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Using the electron phase space density (PSD) data measured by Van Allen Probe A from January 2013 to April 2015, we investigate the effects of magnetospheric processes on relativistic electron dynamics in the Earth's outer radiation belt during 50 geomagnetic storms. A statistical study shows that the maximum electron PSDs for various μ (μ = 630, 1096, 2290, and 3311 MeV/G) at L*~4.0 after the storm peak have good correlations with storm intensity (cc~0.70). This suggests that the occurrence and magnitude of geomagnetic storms are necessary for relativistic electron enhancements at the inner edge of the outer radiation belt (L* = 4.0). For moderate or weak storm events (SYM‐Hmin > ~−100 nT) with weak substorm activity (AEmax < 800 nT) and strong storm events (SYM‐Hmin ≤ ~−100 nT) with intense substorms (AEmax ≥ 800 nT) during the recovery phase, the maximum electron PSDs for various μ at different L* values (L* = 4.0, 4.5, and 5.0) are well correlated with storm intensity (cc > 0.77). For storm events with intense substorms after the storm peak, relativistic electron enhancements at L* = 4.5 and 5.0 are observed. This shows that intense substorms during the storm recovery phase are crucial to relativistic electron enhancements in the heart of the outer radiation belt. Our statistics study suggests that magnetospheric processes during geomagnetic storms have a significant effect on relativistic electron dynamics.

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Solar wind conditions leading to efficient radiation belt electron acceleration: A superposed epoch analysis

Li¹,

Thorne²,

Bortnik³

et al. 2015

Geophysical Research Letters

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Determining preferential solar wind conditions leading to efficient radiation belt electron acceleration is crucial for predicting radiation belt electron dynamics. Using Van Allen Probes electron observations (>1 MeV) from 2012 to 2015, we identify a number of efficient and inefficient acceleration events separately to perform a superposed epoch analysis of the corresponding solar wind parameters and geomagnetic indices. By directly comparing efficient and inefficient acceleration events, we clearly show that prolonged southward Bz, high solar wind speed, and low dynamic pressure are critical for electron acceleration to >1 MeV energies in the heart of the outer radiation belt. We also evaluate chorus wave evolution using the superposed epoch analysis for the identified efficient and inefficient acceleration events and find that chorus wave intensity is much stronger and lasts longer during efficient electron acceleration events, supporting the scenario that chorus waves play a key role in MeV electron acceleration.

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Revisit of relationship between geosynchronous relativistic electron enhancements and magnetic storms

Cited by 33 publications

References 23 publications

Oblique Whistler-Mode Waves in the Earth’s Inner Magnetosphere: Energy Distribution, Origins, and Role in Radiation Belt Dynamics

Oblique Whistler-Mode Waves in the Earth’s Inner Magnetosphere: Energy Distribution, Origins, and Role in Radiation Belt Dynamics

The effects of magnetospheric processes on relativistic electron dynamics in the Earth's outer radiation belt

Solar wind conditions leading to efficient radiation belt electron acceleration: A superposed epoch analysis

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