Whistler observations of magnetospheric electric field in the night side plasma-sphere at low latitude

A case study of whistlers recorded at Varanasi (L = 1.07)

“…(8) equatorial electric fields corresponding to L = 2.12-2.76 during post-midnight sector come out to be ∼0.2-0.3 mV/m in close agreement with those reported by other workers (Block and Carpenter, 1974;Andrews et al, 1978;Park, 1978;Mishra et al, 1980;Saxton and Smith, 1989;Singh et al, 1998). Khosa et al (1982) evaluated electric fields from whistlers recorded at Gulmarg (L = 1.2) and Nainital (L = 1.12) showed that the electric fields during the observation periods in the equatorial plane of the recording station was directed eastward in the pre-midnight sector with the magnitude of 0.33-0.70 mV/m and 0.3 mV/m respectively. Further, They also found westward field in the post-midnight sector with magnitudes of 0.2-0.7 mV/m, 0.3-0.5 mV/m and 0.1-0.3 mV/m in the equatorial plane of Gulmarg, Nainital and Varanasi respectively.…”

Simultaneous observation of whistlers and emissions during a geomagnetically quiet period at low latitude

“…The estimation of E is independent of the assumed electron density distribution along the field lines. The whistler wave technique has been widely used to measure the convective electric fields during sub-storm period as well as during quiet periods (Carpenter and Stone 1967;Park and Carpenter 1970;Carpenter and Akasofu 1972;Block and Carpenter 1974;Rycroft 1974;Carpenter and Seely 1976;Park 1976Park , 1978Carpenter 1978;Andrews et al 1978;Andrews 1980;Mishra et al 1980;Khosa et al 1982;Lalmani 1984;Rash et al 1986;Saxton and Smith 1989;Singh 1995). The main results are summarized by Singh et al (1998) which shows that the quiet time electric fields usually lie between 0.05 mV m −1 and 0.15 mV m −1 .…”

“…The waves propagating through the plasma medium is dispersed, high frequencies preceding the low frequencies, and the entire signals are called whistlers. The analysis of whistler dispersion yields information about the plasma medium parameters such as electron density, total electron content of a flux tube (Mathur and Rycroft 1972;Park 1973;Rycroft 1973;Ralchovski 1976;Park et al 1978;Lester and Smith 1980;Corcuff and Corcuff 1982;Tarcsai et al 1988;Sazhin et al 1992;Khosa et al 1990;Lalmani et al 1992Lalmani et al , 1996Singh et al 1993Singh et al , 1998Singh et al , 2004b, electron temperature (Scarf 1962;Guthart 1965;Sazhin et al 1990Sazhin et al , 1993, magnetic field and large scale convective electric fields (Wang and Kim 1972;Block and Carpenter 1974;Carpenter and Seely 1976;Park 1976Park , 1978Mishra et al 1980;Ralchovski 1981;Khosa et al 1982;Rash et al1986;Lalmani et al 1996;Singh et al 1998).…”