ADWRK 2.0 software complex for estimating whistler dispersion and plasmasphere characteristics has been developed

Authors: Leading Researcher of the Laboratory of Physical Process Modeling of IKIR FEB RAS, Dr. Sci. (Phys.-Math.) Parovik Roman Ivanovich, and Leading Specialist of IKIR FEB RAS, Marchenko Ludmila Sergeevna.

"ADWRK 2.0 – software complex for estimating whistler dispersion and plasmasphere characteristics" is aimed at calculating whistler dispersion and plasmasphere characteristics, electron concentration in the Earth magnetic force lines.

The software complex core is the processing of whistler spectra, which are supplied in a sound file with .wav extension. Then a spectrogram and signal amplitude component are constructed.

A user may select a time range in the sound file and the frequency band for whistler analysis. The software complex implements algorithms of threshold filtering and clustering for detecting whistler trace on its spectrogram. A user may select filtering threshold value.

In the "Clusters" subprogram, besides the clustering DBSCAN method, clustering can be done manually. Applying coordinate transformation, pure whistler trace can be straightened and linear regression equation is constructed. Its slope angle provides an estimate of the dispersion.

In the "CECP" subprogram, the Park’s diffusion equilibrium model is implemented to estimate plasmasphere characteristics, such as gyro frequency, magnetic force line characteristic and its electron concentration at the top, at the height of 1000 km and its integral distribution.

Due to the fact that the whistler observation site in Kamchatka is located in mid-latitudes, to estimate these characteristics, nose frequency and whistler group delay time are unknown. In order to determine them, linear extrapolation method, based on pure whistler trace transformation, was implemented.