Мониторинг области ускорения при помощи аврорального километрового радиоизлучения

Геомагнетизм и аэрономия. 2020. Т. 60. № 5. С. 566–575.

Чугунин Д. В., Chernyshov A., Моисеенко И. Л., Викторов М. Е., Могилевский М. М.

A method is proposed for the study of the height–time characteristics of physical processes in the
region of auroral electron acceleration. Auroral kilometer radiation, which is generated at the local electron
gyrofrequency, can be used to obtain the height distribution of the properties of a radiation source in the auroral
region, and long-term satellite measurements of the auroral kilometric radiation allows the evolution of
these features to be tracked over time. This approach to the analysis of auroral kilometric radiation makes it
possible to obtain data remotely on variations in the features of its source concurrently along the magnetic
field line of the acceleration region. This approach has been used here to analyze the auroral kilometric radiation
recorded on the INTERBALL-2 satellite within the POLRAD experiment. The analysis has revealed a
regular change in the wavelet spectra of fluctuations in the auroral kilometric radiation along the magnetic field
line. In the given frequency range with an almost constant radiation intensity, the fluctuation spectrum follows a
power law at high altitudes and becomes uniform over all characteristic times at low altitudes. This spectral transformation indicates that the processes in the source of auroral kilometric radiation are nonlinear.

Keywords: магнитосфера, вейвлет анализ, авроральное километровое излучение