HOME /

Publications

2018
Li, J., Bortnik, J., An, X., Li, W., Russell, C. T., Zhou, M., Berchem, J., et al. (2018). Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions. Geophysical Research Letters. Publisher's VersionAbstract
Abstract In the Earth's dayside reconnection boundary layer, whistler mode waves coincide with magnetic field openings and the formation of the resultant anisotropic electrons. Depending on the energy range of anisotropic electrons, whistlers can grow at frequencies in the upper and/or lower band. Observations show that whistler mode waves modulate Langmuir wave amplitude as they propagate toward the X line. Observations of whistler mode wave phase and Langmuir waves packets, as well as coincident electron measurements, reveal that whistler mode waves can accelerate electrons via Landau resonance at locations where E||is antiparallel to the wave propagation direction. The accelerated electrons produce localized beams, which subsequently drive the periodically modulated Langmuir waves. The close association of those two wave modes reveals the microscale electron dynamics in the exhaust region, and the proposed mechanism could potentially be applied to explain the modulation events observed in planetary magnetospheres and in the solar wind.
Nishimura, Y., Bortnik, J., Li, W., Angelopoulos, V., Donovan, E.  F., & Spanswick, E.  L. (2018). Comment on ``Pulsating Auroras Produced by Interactions of Electrons and Time Domain Structures'' by Mozer Et Al. Journal of Geophysical Research (Space Physics) , 123, 2064-2070.
Mourenas, D., Zhang, X. - J., Artemyev, A.  V., Angelopoulos, V., Thorne, R.  M., Bortnik, J., Neishtadt, A.  I., et al. (2018). Electron Nonlinear Resonant Interaction With Short and Intense Parallel Chorus Wave Packets. Journal of Geophysical Research (Space Physics) , 123, 4979-4999.
Kim, H., Hwang, J., Park, J., Bortnik, J., & Lee, J. (2018). Global Characteristics of Electromagnetic Ion Cyclotron Waves Deduced From Swarm Satellites. Journal of Geophysical Research (Space Physics) , 123, 1325-1336.
Meredith, N.  P., Horne, R.  B., Kersten, T., Li, W., Bortnik, J., Sicard, A., & Yearby, K.  H. (2018). Global Model of Plasmaspheric Hiss From Multiple Satellite Observations. Journal of Geophysical Research (Space Physics) , 123, 4526-4541.
Pinto, V.  A., Kim, H. - J., Lyons, L.  R., & Bortnik, J. (2018). Interplanetary Parameters Leading to Relativistic Electron Enhancement and Persistent Depletion Events at Geosynchronous Orbit and Potential for Prediction. Journal of Geophysical Research (Space Physics) , 123, 1134-1145.
Marshall, R.  A., & Bortnik, J. (2018). Pitch Angle Dependence of Energetic Electron Precipitation: Energy Deposition, Backscatter, and the Bounce Loss Cone. Journal of Geophysical Research (Space Physics) , 123, 2412-2423.
Ma, Q., Li, W., Bortnik, J., Thorne, R.  M., Chu, X., Ozeke, L.  G., Reeves, G.  D., et al. (2018). Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events. Journal of Geophysical Research (Space Physics) , 123, 1938-1952.
Seppälä, A., Douma, E., Rodger, C.  J., Verronen, P.  T., Clilverd, M.  A., & Bortnik, J. (2018). Relativistic Electron Microburst Events: Modeling the Atmospheric Impact. Geophysical Research Letters , 45, 1141-1147.
da Silva, C.  L., Denton, R.  E., Hudson, M.  K., Millan, R.  M., Liu, K., & Bortnik, J. (2018). Test-Particle Simulations of Linear and Nonlinear Interactions Between a 2-D Whistler-Mode Wave Packet and Radiation Belt Electrons. \grl , 45, 5234-5245.
2017
Cao, X., Ni, B., Summers, D., Bortnik, J., Tao, X., Shprits, Y.  Y., Lou, Y., et al. (2017). Bounce resonance scattering of radiation belt electrons by H$^+$ band EMIC waves. Journal of Geophysical Research (Space Physics) , 122, 1702-1713.
Yue, C., Bortnik, J., Thorne, R.  M., Ma, Q., An, X., Chappell, C.  R., Gerrard, A.  J., et al. (2017). The Characteristic Pitch Angle Distributions of 1 eV to 600 keV Protons Near the Equator Based On Van Allen Probes Observations. Journal of Geophysical Research (Space Physics) , 122, 9464-9473.
Yue, C., Chen, L., Bortnik, J., Ma, Q., Thorne, R.  M., Angelopoulos, V., Li, J., et al. (2017). The Characteristic Response of Whistler Mode Waves to Interplanetary Shocks. Journal of Geophysical Research (Space Physics) , 122 (A11), 10.
Li, J., Bortnik, J., An, X., Li, W., Thorne, R.  M., Zhou, M., Kurth, W.  S., et al. (2017). Chorus Wave Modulation of Langmuir Waves in the Radiation Belts. \grl , 44, 11.
Li, J., Bortnik, J., Li, W., Thorne, R.  M., Ma, Q., Chu, X., Chen, L., et al. (2017). Coherently modulated whistler mode waves simultaneously observed over unexpectedly large spatial scales. Journal of Geophysical Research (Space Physics) , 122, 1871-1882.
Han, D. - S., Li, J. - X., Nishimura, Y., Lyons, L.  R., Bortnik, J., Zhou, M., Liu, J. - J., et al. (2017). Coordinated observations of two types of diffuse auroras near magnetic local noon by Magnetospheric Multiscale mission and ground all-sky camera. \grl , 44, 8130-8139.
Ma, Q., Li, W., Thorne, R.  M., Bortnik, J., Reeves, G.  D., Spence, H.  E., Turner, D.  L., et al. (2017). Diffusive Transport of Several Hundred keV Electrons in the Earth's Slot Region. Journal of Geophysical Research (Space Physics) , 122, 10.
An, X., Bortnik, J., Van Compernolle, B., Decyk, V., & Thorne, R. (2017). Electrostatic and whistler instabilities excited by an electron beam. Physics of Plasmas , 24 (7), 072116.
Chu, X.  N., Bortnik, J., Li, W., Ma, Q., Angelopoulos, V., & Thorne, R.  M. (2017). Erosion and refilling of the plasmasphere during a geomagnetic storm modeled by a neural network. Journal of Geophysical Research (Space Physics) , 122, 7118-7129.
Ofman, L., Denton, R.  E., Bortnik, J., An, X., Glocer, A., & Komar, C. (2017). Growth and nonlinear saturation of electromagnetic ion cyclotron waves in multi-ion species magnetospheric plasma. Journal of Geophysical Research (Space Physics) , 122, 6469-6484.

Pages