1. Altaf, M.: Simultaneous observations of daytime whistlers and VLF/ELF emissions at a low latitude Indian ground station. J. Environ. Nanotechnol. 4, 37–45 (2015)
2. Anderson, R.R., Maeda, K.: VLF emissions associated with enhanced magnetospheric electrons. J. Geophys. Res. 82, 135–146 (1977)
3. Andronov, A.A., Trakhtengerts, Y.V.: Kinetic instability of Earth’s outer radiation belt. Geomagn. Aeron. 4, 233–242 (1964)
4. Belyakova, S.I., Zaitseva, S.A. Pudovkin, M.I.: The development of polar storm. Geomagn. Aeron. 8, 710–718 (1968)
5. Brutis, W.J., Helliwell, R.A.: Magnetospheric chorus: occurrence patterns and normalized frequency. Planet. Space Sci. 24, 1007–1024 (1976)