people: Jay R. Johnson

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	Jay R. Johnson Office: C-Site T155 Phone: (609) 243-2603 email: jrjohnson@pppl.gov

Dr. Jay Johnson is a Staff Research Physicist at the Princeton Plasma Physics Laboratory. He received his Ph.D. degree from Massachusetts Institute of Technology in 1992. Since then, he has held research positions at the University of Alaska, Massachusetts Institute of Technology, and Princeton Plasma Physics Laboratory. He has published more than 20 papers on theoretical plasma physics. Dr. Johnson's area of expertise is in theoretical plasma physics with emphasis on applications to space plasmas. His past work includes areas of mode conversion associated with the development of a kinetic-fluid model, kinetic alfven waves and associated plasma transport, linear mode conversion of alfven ion cyclotron waves in a multi-ion species plasma, global mirror modes, plasma stability analysis, and nonlinear plasma waves. In particular, he has shown that kinetic alfven waves could be a significant source for the observed plasma transport across the interface between the solar winds and magnetosphere. He has also shown that alfven ion cyclotron waves generated in the equatorial region of the magnetosphere could propagate earthward along magnetic field lines and tunnel through the "stop gaps" associated with the minority ion species. He has demonstrated a detailed mode conversion analysis that substantial coupling between the propagating modes occurs near the minority ion resonances and that substantial wave power is both transmitted and absorbed. Both the transmitted and wave power can contribute substantially to energization and outflow of oxygen ions from the ionosphere. Recently, he has demonstrated that kinetic Alfven waves at the magnetopause could be a significant source for the observed plasma transport across the interface between the solar wind and magnetosphere.

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