Fundamental emission for type III bursts in the interplanetary medium - The role of ion-sound turbulence

Physics

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Electrostatic Waves, Interplanetary Medium, Ion Acoustic Waves, Plasma Turbulence, Type 3 Bursts, Electron Energy, Kinematics, Magnetohydrodynamic Stability, Plasma Frequencies

Scientific paper

It is suggested that type III radio emission and streaming electron onset times imply that interplanetary medium type III bursts are mostly generated at the fundamental, and that recent ion-sound wave observations in the medium compel a revision of burst generation mechanisms to include these waves. Such a revision of the theory is presented, along with a discussion of the effects of ion-sound waves on type III bursts. It is shown that (1) ion-sound waves cause enhanced fundamental emission, (2) second harmonic emission is also enhanced at electron temperatures greater than 500,000 K, but suppressed below that temperature, (3) very low frequency ion-sound waves can scatter type III radiation, and (4) ion-sound waves of the required frequencies may be present, and play important roles, in the generation of type III bursts.

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