[PEM13-P01] Evaluation of wave normal and Poynting vector analyses for whistler mode waves observed by the waveform capture (WFC) on board the Arase
Keywords:Whistler mode wave, Waveform Capture, Direction finding, Plasma wave
In the present paper, we developed a direction finding system applicable to whistler mode waves using the data from waveform capture (WFC), which is one of receivers covering the frequency range below 20kHz implemented in the PWE. The absolute directions of the wave normal and Poynting vectors were derived in the coordinate system referring the ambient magnetic field and geomagnetic meridian plane. We also estimated the Poynting vector theoretically using the derived wave normal vector, electron density and ambient magnetic field intensity to confirm the validity of the results from the observation data.
We demonstrated that the results were generally reliable, but further calibration is necessary for electric field to improve the accuracy of Poynting vector because the waveform of electric field is now calibrated under the assumptions of theoretical antenna capacitance in a vacuum and typical plasma impedance. In other words, we expect to be able to correct the calibration table for electric field measurements from the direction finding results.
In the presentation, we introduce some typical results which have been derived from the observation data of upper- and lower-band chorus, and lightning whistlers.