Bortnik Research Group

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 Version Abstract

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.

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.

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.

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.

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.

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.

Bortnik Research Group

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