The Professional Preparation section lists academic qualifications such as degrees and diplomas. Each record stores the degree, major, institution and year. The records can also be hidden from public view by checking the hide checkbox. Please click here for available slides.
The Research and Expertise section describes the areas in which you have expertise or are involved in research. Research Explorer's search engine indexes data in this field for keyword searches. Please click here for available slides.
Interaction of electromagnetic waves and energetic charge particles in geospace plasma
Modeling of radiation belt dynamics
Instability and propagation of plasma waves
Applications of plasma waves
The Earth’s magnetosphere, our geospace environment a few thousand kilometers above the Earth’s surface, consists of energetic charge particles trapped by the Earth’s magnetic field. Those energetic particles exhibit great variability due to solar activities, and pose a great threat to spacecraft orbiting in it and to astronauts. Understanding and predicting their variability are of great interest for space weather. A variety of naturally occurring electromagnetic waves, from Ultra Low Frequency to Very Low Frequency, play important roles in dynamics of those energetic charge particles, especially the radiation belts referring to population of electrons and protons with relativistic energy in geospace. The physical process involved is called wave-particle resonant interaction, where electromagnetic waves seen by particles match fundamental frequencies of trapped particles, leading to stochastic change in particles’ energy and momentum. My research interest is to study the nature of electromagnetic waves in our geospace and the effect of wave-particle interaction. We use various numerical simulation techniques to address the following questions, how are electromagnetic waves generated due to what kind of free energy, how do them propagate in complex geospace medium, where is the wave energy absorbed, how those waves affect energetic particles, and how do we model temporal evolution and spatial distribution of energetic particle population due to wave-particle interaction. These questions are the compelling science topics of the NASA’s $700M two-twin Van Allen Probes Mission. The mission, named after Dr. Van Allen who made the discovery of the radiation belts in 1958, was launched in 2012 August and aims at identifying fundamental mechanisms responsible for radiation belt loss and acceleration.
For more information on Van Allen Probes from NASA
The Publications section lists any and all publications worked on. Research Explorer's search engine indexes data in this field for keyword searches. The category field is a user defined field where any number of categories can be created by the user to categorize publications. For example, publications can be categorized by the Journal that they appear in. Please click here for available slides.
Omidi, N., J. Bortnik, R. Thorne, and L. Chen, Impact of cold O+ ions on the generation and evolution of EMIC waves, J. Geophys. Res., 118, 434-445, doi:10.1029/2012JA018319. Category: JGR
Chen, L., R. Thorne, W. Li, and J. Bortnik, Modeling the Wave Normal Distribution of Chorus Waves, J. Geophys. Res., 118, doi:10.1029/2012JA018343. Category: JGR
Meredith, N. P., R. B. Horne, J. Bortnik, R. M. Thorne, L. Chen, W. Li, and A. Sicard-Piet, Global statistical evidence for chorus as the embryonic source of plasmaspheric hiss, Geophys. Res. Lett., 40, doi:10.1002/grl.50593. Category: GRL
de Soria-Santacruz, M., M. Spasojevic, and L. Chen, EMIC waves growth and guiding in the presence of cold plasma density irregularities, Geophys. Res. Lett., 40, doi:10.1002/grl.50484. Category: GRL
Li, W., J. Bortnik, R. Thorne, C. Cully, L. Chen, V. Angelopoulos, T. Nishimura, J. Tao, J. Bonnell, and O. LeContel, Characteristics of the Poynting flux and wave normal vectors of whistler-mode waves observed on THEMIS, J. Geophys. Res., 118, 1461–1471, doi:10.1029/2012JA018609. Category: JGR
The Appointments section lists work experience including previous appointments. Research Explorer's search engine indexes data in this field for keyword searches. Please click here for available slides.
The Additional Information section describes any other topics you wish to display on your profile that is not in another section. Research Explorer's search engine indexes data in this field for keyword searches. Please click here for available slides.
2012 American Geophysical Union Space Physics and Aeronomy Section‘s 2012 Fred L. Scarf Award Given annually to a recent recipient of a Ph.D. for outstanding dissertation researchthat contributes directly to solar-planetary science.
2012 Nominee for the Chancellor‘s Award for Postdoctoral Research, UCLA. The award is given to recognize the important contributions that postdoctoral scholars from a variety of academic areas make to UCLA’s research mission.
2010 Jacob A. Bjerknes Award. Given for graduate students of the outstanding research by the Department of Atmospheric and Oceanic Sciences, UCLA
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