Abstract—This paper reports an unexpected simultaneous observation of whistlers and different types of ELF/VLF emissions during daytime at a low latitude Indian ground station Jammu (geomag. lat., 22^o 26^/ N; L=1.17), which are (a) pulses of atmospheric bursts, (b) discrete chorus riser ELF emissions triggered from the bottom of the atmospherics, (c) whistlers, (d) whistler-triggered discrete chorus riser VLF emissions triggered from the lower end of the whistler, (e) long enduring ELF/VLF hiss emissions, (f) band limited pulsing ELF/VLF hiss emissions, (g) hook and inverted hook ELF emissions, (h) oscillating tone discrete chorus riser ELF emissions. The simultaneous observations of this type during daytime has not been found in any of the Indian stations and is the first such observation to be reported in this paper. The observed characteristics of these simultaneously recorded whistlers and ELF/VLF emissions are described and interpreted. The data presented here indicate that there is a strong possibility that lightning is an important source of different types of ELF/VLF emissions at least in the embryonic sense.

Index Terms—Whistlers, ELF/VLF emissions, hiss, chorus, pulsing hiss, hook, inverted hook.

S. A. Sheikh and Farooq Ahmad are with the Department of Physics, University of Kashmir, Srinagar- 190006, Kashmir, India (e-mail: shabir_222@rediffmail.com).
K. K. Singh is with the Department of Physics, Banaras Hindu University, Varanasi 221005, India.
Lalmani is with the Department of Physics, National Institute of Technology, Srinagar-190006, Kashmir, India

Cite: S. A. Sheikh, K. K. Singh, Farooq Ahmad, and Lalmani, "On the Simultaneous Observations of Daytime Whistlers and ELF/ VLF Emissions at Low Latitudes: A Review," International Journal of Applied Physics and Mathematics  vol. 2, no. 6, pp. 462-466, 2012.