An experimental study of hiss-triggered chorus emissions at low latitude

Hiss-triggered chorus emissions recorded at low-latitude ground station Gulmarg (geomag. lat., 24°26N; geomag. long., 147°09E, L = 1.28) on March 8, 1986 are reported. From the detailed spectral analysis of these emissions, it is found that the chorus is hiss-triggered and each chorus element has tendency to originate from the hiss band. Based on the theory of Helliwell, and previous satellite VLF data, a possible generation mechanism of low-latitude hiss-triggered chorus emissions is proposed. An attempt has been made to find out the chorus source location and the length of resonance region from which the various parameters associated with generation mechanism are determined.