@InProceedings{MuralikrishnaKulk:2009:RoMeDu,
               author = "Muralikrishna, Polinaya and Kulkarni, V. H.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {University 
                         of Bombay}",
                title = "Role of meteoric dust in the e-region dynamics",
            booktitle = "Proceedings...",
                 year = "2009",
         organization = "Iaga, 2009.",
             keywords = "Meteoric Dust, E-region dynamics, Electrical conductivity, 
                         Collision frequency.",
             abstract = "Dust particles play an important role in the dynamics of the 
                         E-region. Ablation of meteors that enter the atmosphere with 
                         velocities ¡{\"O}15 kms-1 is the most important source of these 
                         dust particles of micron and submicron sizes. Polar Mesospheric 
                         Summer Echoes in the polar region and the blanketing sporadic-E 
                         layers in the low latitude E-region are known to be manifestations 
                         of dust particles. Large amounts of dust particles with average 
                         sizes of about 0.1¦{\`{\I}} with number densities of up to 
                         several thousands per cubic centimeter and charge densities of the 
                         same order were detected experimentally. In some parts of the dust 
                         layers it was found that the negative charge density on dusts was 
                         so large that the number of free electrons was significantly 
                         reduced there, since the dust acted as a sink for electrons, thus 
                         causing electron bite outs. Recent studies show the possible role 
                         of neutral as well as charged dust particles of submicron size in 
                         altering the conductivity parameters in the equatorial E-region 
                         through the collision frequencies. In the upper E-region the dust 
                         particles are not very effective in capturing the ambient 
                         electrons and so do not affect the quase neutrality of the plasma. 
                         But they can alter the effective collision frequencies of the 
                         ambient electrons in this region by a factor as high as 4. They 
                         can also reduce significantly the growth rate and amplitude of 
                         plasma irregularities in this region. In the lower E-region the 
                         dust particles get charged by capturing the ambient electrons and 
                         affect significantly the electrical conductivities. When exist in 
                         sufficient numbers, charged dust particles can even reverse the 
                         ambient vertical polarization electric field in the lower E-region 
                         altitudes. Assuming a simple exponential model for the dust layer, 
                         the role of these dust particles in altering the E-region dynamics 
                         by affecting the collision and conductivity parameters is 
                         investigated here.",
  conference-location = "Sopron, Hungary",
      conference-year = "23-30 Aug.",
             language = "en",
        urlaccessdate = "10 maio 2024"
}