Cyclotron Theory of Very-Low-Frequency Discrete Emissions

Abstract

IT was recently shown1 that the Doppler shifted cyclotron radiation from receding electrons would give the observed frequency-time shape of discrete very-low-frequency emissions. A further development enables information about these electrons to be deduced from this shape. Thus, electron energy (E), initial helical pitch angle (ψ0), geomagnetic field line of occurrence (λ), and the exosphere electron density parameter2, ‘scale frequency’ (fa), are obtained from four parameters (two frequencies and two times) scaled from a spectrogram of the emission. Full details of this process will be published elsewhere.