The derivation of bi-Maxwell distribution variables from chorus emissions detected on the ground

“ACHDANet” (Automatic Chorus and Hiss Detector and Analyzer Network) project is an analogy to, and additional product of the well-known AWDANet. Our mission is to create a monitoring system which nowcast the source population in the Radiation Belts based on ground-detected chorus emissions by the AWDANet stations at L > Lpp . In our recent paper, we introduced a direct method to derive the approximate biMaxwellian parameters of the source population from the starting frequency and frequency sweep rate of individual chorus emissions. The chorus inversion method was tested successfully on Van Allen Probes EMFISIS and ECT-HOPE data. That chorus inversion method fulfill the requirements of a future automatic detector and analyzer system: a robust technique which inputs are spectrogram of chorus emissions recorded on the ground, fce gyrofrequency and fpe plasmafrequency at the assumed source region. As a next step, the effects of propagation is under investigation. In this paper we examine the application domain of the most robust propagation model, namely, propagation with a group velocity quasi-parallel to the magnetic field. In this model we apply an empirical density model for plasmatrough and the critical frequency of F2 region f0F2 for ionosphere. We present the first results of Van Allen Probes EMFISIS and AWDANet chorus emissions which were simultaneously detected and analyzed.

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