 |
 |
 |
 |
 |
 |
|
|
|
|
|
|
Obayashi, T., 1965: Hydromagnetic whistlers. J. Geophys. Res., 70, 1069-1078.
Hydromagnetic emissions consisting of a series of overlapping wavetrains of rising frequency are explained by hydromagnetic waves of anisotropic mode propagating along the field-aligned paths in the magnetosphere. The rising frequency of emission is attributed to the dispersive nature of the velocity of waves; the repetitive period of wavetrains is associated with the transit time of the wave packet bouncing between geomagnetic conjugate points along the line of force. It is suggested that an initiating wave is triggered by spontaneously injected high energy particles of superluminal motion and that the wave is subsequently amplified by plasma beams through the mechanism of cyclotron instabilities.
|
|
|
