Abstract
Some unusual discrete VLF emissions observed at a low-latitude ground station at Agra
Highlights
The wave-particle interactions occurring in the magnetosphere generate a variety of emissions in the ELF/VLF range. Helliwell (1965) has classi®ed these emissions into hiss, discrete, periodic, chorus, and triggered emissions. Rycroft (1972) and Sazhin and Hayakawa (1992) have presented excellent reviews on magnetospheric chorus emissions observed in the ground stations, rockets, and satellites. Nunn and Sazhin (1991) and Trakhtengertz et al (1996) have presented chorus models recently.Though, the VLF emissions are basically a middleand high-latitude phenomena, there are ample evidences of their occurrence in low-latitude ground stations
The existence of intense zones of ELF/VLF emissions in the low-latitude ionosphere has been con®rmed by satellite observations (Bullough et al, 1974)
The VLF emissions are observed with the same set of equipments as that required for the observations of whistlers
Summary
The wave-particle interactions occurring in the magnetosphere generate a variety of emissions in the ELF/VLF range. Helliwell (1965) has classi®ed these emissions into hiss, discrete, periodic, chorus, and triggered emissions. Rycroft (1972) and Sazhin and Hayakawa (1992) have presented excellent reviews on magnetospheric chorus emissions observed in the ground stations, rockets, and satellites. Nunn and Sazhin (1991) and Trakhtengertz et al (1996) have presented chorus models recently. Helliwell (1965) has classi®ed these emissions into hiss, discrete, periodic, chorus, and triggered emissions. Rycroft (1972) and Sazhin and Hayakawa (1992) have presented excellent reviews on magnetospheric chorus emissions observed in the ground stations, rockets, and satellites. The existence of intense zones of ELF/VLF emissions in the low-latitude ionosphere has been con®rmed by satellite observations (Bullough et al, 1974). We pick up some interesting cases of unusual discrete VLF emissions observed at our low-latitude ground station Agra during two dierent whistler campaign periods and interpret their unusual characteristics
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