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In this study we present an inversion method which provides thermal plasmapopulation parameters from characteristics of chorus emissions only. Ourultimate goal is to apply this method to ground based data in order to derivethe lower energy boundary condition for many radiation belt models. The firststep is to test the chorus-inversion method on in-situ data of Van Allen Probesin the generation region. Density and thermal velocity of energetic electrons(few keV - 100 keV) are derived from frequency sweep rate and startingfrequencies of chorus emissions through analysis of wave data from Electric andMagnetic Field Instrument Suite and Integrated Science (EMFISIS) onboard theVan Allen Probes. Nonlinear wave growth theory of \citet{omura2011triggering}serves as the basis for our inversion method, assuming that the triggering waveis originated by the linear cyclotron instability. We present sixteen,consecutive rising-tone emissions recorded in the generation region between11-12UT on 14 November 2012. The results of the inversion are compared withdensity and thermal velocities (parallel and perpendicular) of energeticelectrons derived from unidirectional flux data of Helium Oxygen ProtonElectron (HOPE) instrument, showing a good agreement: the normalizedroot-mean-square deviation between the measured and predicted values are$\sim13\%, \sim6\%$, and $\sim10\%$, respectively. We found that thetheoretical amplitudes are consistent with the measured ones. The relationbetween linear and nonlinear wave growth agrees with our basic assumption,namely, linear growth is a preceding process of nonlinear wave growth. Weanalyze electron distributions at the relativistic resonant energy ranges.

Evaluation of Plasma Properties From Chorus Waves Observed at the Generation Region