Relativistic theory of wave‐particle resonant diffusion with application to electron acceleration in the magnetosphere

Summers, Danny; Thorne, R. M.; Xiao, Fuliang

doi:10.1029/98ja01740

Cited by 777 publications

(873 citation statements)

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“…Theoretical calculations suggest that ULF acceleration mechanisms should be substantially reduced in efficiency at lower L, compared to geosynchronous orbit (Fälthammar and Walt 1969;Elkington et al 2003). On the other hand, local acceleration involving VLF waves, particularly lower-band chorus, becomes most efficient in the region just outside the plasmapause, which corresponds to the radial range 3-5 RE for storm conditions (Summers et al 1998;Meredith et al 2003b).…”

Section: Which Physical Processes Produce Radiation Belt Enhancement mentioning

confidence: 99%

“…Since the power in ULF waves is considerably enhanced during magnetic storms (Mathie and Mann 2000), radial diffusion is a potentially important mechanism for energetic electron acceleration (Rostoker et al 1998;Elkington et al 1999;Hudson et al 2001;O'Brien et al 2001;Shprits and Thorne 2004) or loss (Shprits et al 2006;Jordanova et al 2008;) during storm conditions, dependent on the radial gradient in phase space density. Higher frequency ELF and VLF waves cause violation of the first two invariants and lead to pitch angle scattering loss to the atmosphere (Thorne and Kennel 1971;Lyons et al 1972;Thorne 1998a, 1998b) or local stochastic energy diffusion (Horne and Thorne 1998;Summers et al 1998;Miyoshi et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…1 A schematic diagram of the equatorial magnetosphere illustrating the spatial regions for wave-particle interactions between relativistic electrons and important plasma waves. Whistler-mode chorus can induce microburst precipitation ) and local stochastic acceleration (Summers et al 1998;) along a broad portion of the electron drift path between midnight and noon. Equatorial magnetosonic waves contribute to local electron acceleration.…”

Section: Introductionmentioning

confidence: 99%

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The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP

et al. 2013

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The Electric and Magnetic Field Instrument and Integrated Science (EMFISIS) investigation on the NASA Radiation Belt Storm Probes (now named the Van Allen Probes) mission provides key wave and very low frequency magnetic field measurements to understand radiation belt acceleration, loss, and transport. The key science objectives and the contribution that EMFISIS makes to providing measurements as well as theory and modeling are described. The key components of the instruments suite, both electronics and sensors, including key functional parameters, calibration, and performance, demonstrate that EMFI-SIS provides the needed measurements for the science of the RBSP mission. The EMFISIS operational modes and data products, along with online availability and data tools provide the radiation belt science community with one the most complete sets of data ever collected.

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Section: Which Physical Processes Produce Radiation Belt Enhancement mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP

et al. 2013

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“…These waves have been shown to be very important in both the acceleration [e.g., Summers et al, 1998;Horne et al, 2005a] and the precipitation [Thorne et al, 2005] of relativistic radiation belt electrons. Chorus waves have also been demonstrated to be the dominant wave mode for scattering plasma sheet electrons into the atmosphere to form the diffuse aurora [Thorne et al, 2010], the pulsating aurora [Nishimura et al, 2010] and to create the pitch angle distributions of energetic electrons observed in the inner magnetosphere [Tao et al, 2011a].…”

Section: Introductionmentioning

confidence: 99%

Effects of amplitude modulation on nonlinear interactions between electrons and chorus waves

Tao

Bortnik

Thorne

et al. 2012

Geophysical Research Letters

117

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[1] The effects of amplitude modulation on nonlinear interactions between a parallel propagating chorus wave packet and electrons in a dipole field are investigated in this work using a test particle code. Previous research used a single wave to model a chorus wave element, leading to nonlinear processes such as phase trapping and bunching when the wave amplitude was large enough. However, high resolution observations of chorus wave packets show a modulation of the wave amplitude, forming the so-called chorus subpackets or subelements. Here we first extend a previous method to model a realistic chorus packet. Using the modeled chorus packet, we demonstrate directly that including the realistic amplitude modulation could significantly affect the behavior of resonant electrons. Our results suggest that the amplitude modulation should be considered in the quantitative treatment of interactions between electrons and chorus waves. Citation: Tao, X., J. Bortnik, R. M. Thorne, J. M. Albert, and W. Li (2012), Effects of amplitude modulation on nonlinear interactions between electrons and chorus waves, Geophys. Res. Lett., 39, L06102,

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“…What is actually happening is the HILDCAAs are related to sporadic, low-intensity particle injections into the outer portions of the ringcurrent, thus the lack of an overall "decay" . The continuous presence of magnetospheric chorus plasma waves (and other wave modes) associated with HILDCAAs has been invoked (Horne and Thorne, 1998;Summers et al, 1998; to explain the magnetospheric relativistic electron events (Baker et al, 1989;Li et al, 1997) present in these intervals of high-speed solar wind streams. These relativistic electrons have been related to the possible failure of a Canadian telecommunication satellite.…”

Section: Hildcaasmentioning

confidence: 99%

Space Storms and Space Weather Hazards

Daglis¹

2001

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Subject Terms Report Classification unclassified Classification of this page unclassified Classification of Abstract unclassified Limitation of Abstract UU Number of Pages 486REPORT DOCUMENTATION PAGE Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, -to review recent spacecraft measurements that have provided new insight into the dynamics and effects of space storms; -to review space weather hazards associated with space storms and pertinent to the operation of technological systems in space and on ground;-to discuss and assess methods of space weather forecasting, as well as national and international initiatives towards an efficient development of space climatology.Space weather, the invisible but nevertheless effective result of solar activity and solar-terrestrial coupling, has affected the operations of communication systems since the appearance of telegraph in the 19th century, though as an unknown trouble factor. Nowadays, the effects of space weather affect in various ways all communication modes, from cable to wireless to space-based systems. Moreover, space weather hazards include malfunction or even permanent damage of power distribution grids and of telecommunication, navigation and surveillance satellites, disturbances of over-the-horizon (OTH) radar, HF, VHF and UHF communications, surveying and navigation systems that use Global Positioning System (GPS) satellites, surveillance (optical and radar), and satellite tracking. Space weather influences on the Earth's weather and climate is still a developing topic. Little is known concerning the biological effects of space weather, especially regarding astronauts.This Institute could not be timelier. Space Weather, which has been defined as "conditions on the sun and in the solar wind, magnetosphere, ionosphere, and thermosphere that can influence the performance and reliability of space-and ground-based technological systems and can endanger human life", encompasses a broad range of phenomena impacting both space science and technology. The effects of Space Weather, while present throughout the solar cycle, gain particular prominence around the peak of the 11-year sunspot activity; the maximum of cycle 23 occurred in summer 2000.The fact that this ASI on Space Weather was held in Europe is particularly appropriate. European countries host a considerable repository of knowledge and world-class facilities in this field. Nevertheless, while Space Weather activities in c...

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Relativistic theory of wave‐particle resonant diffusion with application to electron acceleration in the magnetosphere

Abstract: Abstract.Resonant diffusion curves for electron cyclotron resonance with field-aligned electromagnetic R mode and L mode electromagnetic ion cyclotron (EMIC) waves are constructed using a fully relativistic treatment.

Cited by 777 publications

References 39 publications

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP

Effects of amplitude modulation on nonlinear interactions between electrons and chorus waves

Space Storms and Space Weather Hazards

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