WHISTLER-TRIGGERED VLF EMISSIONS RECORDED AT JAMMU DURING DAY TIME

Ravindra Pratap Patel; Krishna Kumar Singh

doi:10.46587/JGR.2022.v08i01.012

Ravindra Pratap Patel Department of Physics, M. M. H. (P. G.) College, Ghaziabad (U.P.) India
Krishna Kumar Singh Dept. of Physics, Indian Institute of Technology, Banaras Hindu University, Varanasi, India

DOI: https://doi.org/10.46587/JGR.2022.v08i01.012

Keywords: Whistlers, Triggered Emissions, Wave-Particle Interaction, Resonance Conditions.

Abstract

Whistler-triggered VLF emissions recorded at low latitude station Jammu (Geomagnetic latitude = 220 26/ N; L = 1.17) during day time period on 19th February 1999 at 14:35 hrs. IST. The recorded data have been analyzed. Based on whistler-triggered VLF emissions spectrum, the VLF waves propagate along the path with L – values lying between L = 4.4 and 4.38. During the observation period, magnetic activity was very high. Mostly these types of emissions recorded at mid latitudes. These whistler-triggered emission waves propagate along the geomagnetic field lines either in a ducted mode or in a pro-longitudinal mode. Relative amplitude of whistlers waves is almost equal to relative amplitude of triggered emissions. The proposed generation mechanism explains through the dynamic spectra of the whistler-triggered emissions.