Search Results - "Bortnik, J"

Global distribution of wave amplitudes and wave normal angles of chorus waves using THEMIS wave observations by Li, W., Bortnik, J., Thorne, R. M., Angelopoulos, V.

“…The global distribution of chorus wave amplitudes and their wave normal angles is investigated using high‐resolution wave spectra and waveform data from THEMIS…”
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Pitch Angle Dependence of Energetic Electron Precipitation: Energy Deposition, Backscatter, and the Bounce Loss Cone by Marshall, R. A., Bortnik, J.

“…Quantifying radiation belt precipitation and its consequent atmospheric effects requires an accurate assessment of the pitch angle distribution of…”
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ULF Wave Activity Observed in the Nighttime Ionosphere Above and Some Hours Before Strong Earthquakes by Ouyang, X. Y., Parrot, M., Bortnik, J.

“…We examine the relationship between earthquakes and ultralow frequency (ULF) wave activity in the nighttime ionosphere based on the electric field data in the…”
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A unified approach to inner magnetospheric state prediction by Bortnik, J., Li, W., Thorne, R. M., Angelopoulos, V.

“…This brief technique paper presents a method of reconstructing the global, time‐varying distribution of some physical quantity Q that has been sparsely sampled…”
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Rapid local acceleration of relativistic radiation-belt electrons by magnetospheric chorus by Thorne, R. M., Li, W., Ni, B., Ma, Q., Bortnik, J., Chen, L., Baker, D. N., Spence, H. E., Reeves, G. D., Henderson, M. G., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Blake, J. B., Fennell, J. F., Claudepierre, S. G., Kanekal, S. G.

“…High-resolution measurements of electrons obtained by satellite during the geomagnetic storm of 9 October 2012 together with a data-driven global wave model…”
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Quantifying Radiation Belt Electron Loss Processes at L < 4 by Claudepierre, S. G., Ma, Q., Bortnik, J.

“…We present a comprehensive analysis of the processes that lead to quasilinear pitch‐angle‐scattering loss of electrons from the L < 4 region of the Earth's…”
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THEMIS observations of electromagnetic ion cyclotron wave occurrence: Dependence on AE, SYMH, and solar wind dynamic pressure by Usanova, M. E., Mann, I. R., Bortnik, J., Shao, L., Angelopoulos, V.

“…Electromagnetic ion cyclotron (EMIC) waves are transverse plasma waves generated by anisotropic proton distributions with Tperp > Tpara. They are believed to…”
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New chorus wave properties near the equator from Van Allen Probes wave observations by Li, W., Santolik, O., Bortnik, J., Thorne, R. M., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B.

“…The chorus wave properties are evaluated using Van Allen Probes data in the Earth's equatorial magnetosphere. Two distinct modes of lower band chorus are…”
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Nonlinear interaction of radiation belt electrons with electromagnetic ion cyclotron waves by Albert, J. M., Bortnik, J.

“…The rapid loss of radiation belt electrons in the main phase of geomagnetic storms is believed to be aided by EMIC waves, and is usually analyzed with…”
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Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations by Claudepierre, S. G., Ma, Q., Bortnik, J., O'Brien, T. P., Fennell, J. F., Blake, J. B.

“…We use measurements from NASA's Van Allen Probes to calculate the decay time constants for electrons over a wide range of energies (30 keV to 4 MeV) and L…”
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Ion Heating by Electromagnetic Ion Cyclotron Waves and Magnetosonic Waves in the Earth's Inner Magnetosphere by Ma, Q., Li, W., Yue, C., Thorne, R. M., Bortnik, J., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Reeves, G. D., Spence, H. E.

“…Electromagnetic ion cyclotron (EMIC) waves and magnetosonic waves are commonly observed in the Earth's magnetosphere associated with enhanced ring current…”
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Properties of Intense Field‐Aligned Lower‐Band Chorus Waves: Implications for Nonlinear Wave‐Particle Interactions by Zhang, X.‐J., Thorne, R., Artemyev, A., Mourenas, D., Angelopoulos, V., Bortnik, J., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B.

“…Resonant interactions between electrons and chorus waves are responsible for a wide range of phenomena in near‐Earth space (e.g., diffuse aurora and…”
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Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events by Ma, Q., Li, W., Bortnik, J., Thorne, R. M., Chu, X., Ozeke, L. G., Reeves, G. D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Engebretson, M. J., Spence, H. E., Baker, D. N., Blake, J. B., Fennell, J. F., Claudepierre, S. G.

“…We simulate the radiation belt electron flux enhancements during selected Geospace Environment Modeling (GEM) challenge events to quantitatively compare the…”
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Transit time scattering of energetic electrons due to equatorially confined magnetosonic waves by Bortnik, J., Thorne, R. M.

“…Recent analysis using quasilinear theory (QLT) has shown that magnetosonic (MS) waves are able to accelerate electrons to relativistic energies on fast time…”
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Radiation belt electron acceleration by chorus waves during the 17 March 2013 storm by Li, W., Thorne, R. M., Ma, Q., Ni, B., Bortnik, J., Baker, D. N., Spence, H. E., Reeves, G. D., Kanekal, S. G., Green, J. C., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Blake, J. B., Fennell, J. F., Claudepierre, S. G.

“…Local acceleration driven by whistler‐mode chorus waves is fundamentally important for accelerating seed electron populations to highly relativistic energies…”
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Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Comparison With Theory by Claudepierre, S. G., Ma, Q., Bortnik, J., O'Brien, T. P., Fennell, J. F., Blake, J. B.

“…We compute quasilinear diffusion rates due to pitch angle scattering by various mechanisms in the Earth's electron radiation belts. The calculated theoretical…”
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Statistical distribution of EMIC wave spectra: Observations from Van Allen Probes by Zhang, X.‐J., Li, W., Thorne, R. M., Angelopoulos, V., Bortnik, J., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B.

“…It has been known that electromagnetic ion cyclotron (EMIC) waves can precipitate ultrarelativistic electrons through cyclotron resonant scattering. However,…”
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Global Survey of Electron Precipitation due to Hiss Waves in the Earth’s Plasmasphere and Plumes by Ma, Q., Li, W., Zhang, X. ‐J., Bortnik, J., Shen, X. ‐C., Connor, H. K., Boyd, A. J., Kurth, W. S., Hospodarsky, G. B., Claudepierre, S. G., Reeves, G. D., Spence, H. E.

“…We present a global survey of energetic electron precipitation from the equatorial magnetosphere due to hiss waves in the plasmasphere and plumes. Using Van…”
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A Triggering Process for Nonlinear EMIC Waves Driven by the Compression of the Dayside Magnetosphere by Jun, C.‐W., Miyoshi, Y., Nakamura, S., Shoji, M., Hori, T., Bortnik, J., Lyons, L., Shinohara, I., Matsuoka, A.

“…Using the Arase and Van Allen Probes satellite observations, we investigate the nonlinear electromagnetic ion cyclotron (EMIC) rising‐tone (RT) emissions with…”
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Differentiating Between Simultaneous Loss Drivers in Earth's Outer Radiation Belt: Multi‐Dimensional Phase Space Density Analysis by Staples, F. A., Ma, Q., Kellerman, A., Rae, I. J., Forsyth, C., Sandhu, J. K., Bortnik, J.

“…We analyzed the contribution of electromagnetic ion cyclotron (EMIC) wave driven electron loss to a flux dropout event in September 2017. The evolution of…”
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