Extremely small dispersion whistlers and VLF emissions recorded during daytime at Jammu

Abstract

216-220Using an improved system, a unique type of whistlers in addition to the usual types of VLF emissions has been recorded, for the first time in India, in February 1998 during daytime at Jammu (geomagn. lat., 22° 26'N; geomagn. long., 147°10'E; L- l.17). From the dispersion analysis of the daytime whistlers recorded at Jammu it is found that all the whistlers have extremely small dispersion (ESD) in the range of 5-10 s1/2, which clearly supports the nonducted propagation of daytime whistlers at low latitudes, completely in contrast with the earlier findings of ducted propagation of daytime whistlers in the presence of equatorial anomaly