Precipitation of radiation belt electrons by EMIC waves, observed from ground and space

Miyoshi, Yoshizumi; Sakaguchi, Kaori; Shiokawa, K.; Evans, David S.; Albert, J. M.; Connors, Martin; Jordanova, V. K.

doi:10.1029/2008gl035727

Cited by 261 publications

(391 citation statements)

References 32 publications

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“…Sakaguchi et al, 2008;Yahnin et al, 2009), (2) rapid dropout of relativistic electrons from the radiation belt (e.g. Miyoshi et al, 2008), and (3) traveling convection vortices . The pulsations are observed under a wide variety of geomagnetic field configurations.…”

Section: Introductionmentioning

confidence: 99%

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

2013

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We present a global climatology of Pc1 pulsations as observed by the CHAMP satellite from 2000 to 2010. The Pc1 center frequency and bandwidth are about 1 and 0.5 Hz, respectively. The ellipticity is mostly linear with the major axis almost aligned with the magnetic zonal direction. The diurnal variation of Pc1 occurrences shows a primary maximum early in the morning and a secondary maximum during pre-midnight hours. The annual variations of the occurrence rates exhibit a clear preference for local summer. The solar cycle dependence of the occurrence rate reveals a maximum at the declining phase (2004–2005). Neither magnetic activity nor solar wind velocity controls the Pc1 occurrence rate significantly. Pc1 occurrence rate peaks at subauroral latitudes, but the steep cutoff towards higher latitudes is due to auroral field-aligned currents masking the Pc1 pulsations. The center frequency of Pc1 pulsations does not show a clear dependence on latitude. The global distribution of Pc1 exhibits highest occurrence rates near the longitude sector of the South Atlantic Anomaly. Pc1 events at auroral latitudes, although they are rarely detected, show a clear occurrence peak around local noon. A majority of the auroral Pc1 events are observed during solar minimum years

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Section: Introductionmentioning

confidence: 99%

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

2013

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“…A number of studies showed the evidence that the loss of relativistic electrons in the radiation belts is caused by EMIC wave scattering (e.g., Millan et al 2007;Sandanger et al 2007;Rodger et al 2008;Miyoshi et al 2008;Blum et al 2012;Carson et al 2013). Shprits et al (2013) demonstrated that EMIC waves play a crucial role for the dynamics of the ultrarelativistic populations in the radiation belts.…”

Section: Scattering and Heating Of Particles By Emic Waves In The Prementioning

confidence: 99%

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

et al. 2014

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Knowledge of the ion composition in the near-Earth's magnetosphere and plasma sheet is essential for the understanding of magnetospheric processes and instabilities. The presence of heavy ions of ionospheric origin in the magnetosphere, in particular oxygen (O + ), influences the plasma sheet bulk properties, current sheet (CS) thickness and its structure. It affects reconnection rates and the formation of Kelvin-Helmholtz instabilities. This has profound consequences for the global magnetospheric dynamics, including geomagnetic storms and substorm-like events. The formation and demise of the ring current and the radiation belts are also dependent on the presence of heavy ions. In this review we cover recent advances in observations and models of the circulation of heavy ions in the magne- tosphere, considering sources, transport, acceleration, bulk properties, and the influence on the magnetospheric dynamics. We identify important open questions and promising avenues for future research.

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“…EMIC waves are important for electron loss from the radiation belts Albert, 2003;Miyoshi et al, 2008;Kersten et al, 2014]. At lower L corresponding to the inner belt and slot region both EMIC waves and magnetosonic waves have been observed in overlapping regions between L = 1.5 and 2.5 by the Akebono satellite [Kasahara et al, 1992[Kasahara et al, , 1994.…”

Section: Introductionmentioning

confidence: 99%

Propagation and linear mode conversion of magnetosonic and electromagnetic ion cyclotron waves in the radiation belts

Horne

Miyoshi

2016

Geophysical Research Letters

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Magnetosonic waves and electromagnetic ion cyclotron (EMIC) waves are important for electron acceleration and loss from the radiation belts. It is generally understood that these waves are generated by unstable ion distributions that form during geomagnetically disturbed times. Here we show that magnetosonic waves could be a source of EMIC waves as a result of propagation and a process of linear mode conversion. The converse is also possible. We present ray tracing to show how magnetosonic (EMIC) waves launched with large (small) wave normal angles can reach a location where the wave normal angle is zero and the wave frequency equals the so‐called crossover frequency whereupon energy can be converted from one mode to another without attenuation. While EMIC waves could be a source of magnetosonic waves below the crossover frequency, magnetosonic waves could be a source of hydrogen band waves but not helium band waves.

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Precipitation of radiation belt electrons by EMIC waves, observed from ground and space

Cited by 261 publications

References 32 publications

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

Propagation and linear mode conversion of magnetosonic and electromagnetic ion cyclotron waves in the radiation belts

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