@InProceedings{Muralikrishna:2018:MeDuEf,
author = "Muralikrishna, Polinaya",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Meteoric dust effects on the electrodynamics of low latitude
e-region plasma",
year = "2018",
organization = "Cospar Scientific Assembly, 42.",
abstract = "Electrodynamic processes occurring in the E-region of the
equatorial ionosphere can be affected by dust particles of
meteoric origin. The dust particles can capture the ambient
electrons and cause considerable increase in the loss rate of
electrons thus affecting the growth rates and amplitudes of the
plasma irregularities. The attachment of electrons on dust
particles can increase the threshold velocities needed for the
onset of two stream and gradient drift instability mechanisms
responsible for the generation of Type I and Type II plasma
irregularities respectively, observed in the equatorial E-region
plasma. In situ rocket observations also indicate that, under
similar ambient conditions, the amplitudes of Type II
irregularities observed in the lower E-region are considerably
smaller than those observed at higher altitudes. This probably is
a direct evidence for the effect of dust particles that dominate
the lower E-region altitudes practically all the time. Electric
field changes in the low latitude E-Region are attributed to
changing neutral winds and to remote causes like the mapping of
storm time electric field changes or changes in the neutral winds
caused by Sudden Stratospheric Warming (SSW). Variation of
electrojet currents is a manifestation of changing electric fields
and/or electrical conductivities. Changes in the conductivity
parameters, especially in the lower E-region can also be caused by
the ambient dust particles of meteoric origin. Statistical studies
have shown that the monthly occurrence rate of reversals in the
electrojet currents is highly correlated to the monthly mean of
meteor showers. This high correlation is seen even during
geomagnetically disturbed periods. The meteoric dust particles
thus play a very important role in altering the local electrical
conductivities in the lower E-region and in controlling the
electrodynamic processes in this region.",
conference-location = "Pasadena, California",
conference-year = "14-22 July",
language = "en",
targetfile = "murali_meteoric.pdf",
urlaccessdate = "28 mar. 2024"
}