MODELING OF 557.7 nm, 630.0 nm, 732.0 nm AND 844.6 mn DAYGLOW EMISSIONS

Abstract

Extensive studies had been performed on different regions of atmosphere to understand the different processes occurring in these regions. For example Troposphere has been studied because it is of immense importance to the biosphere, while the Stratosphere has always been of interest because of the presence of water vapor, ozone and a number of hydrodynamic processes active there in. The ionosphere due to the presence of significant number of free ions and electrons, is a key region which influences the radio wave propagation, communication and navigation. The thermosphere is the source region for the ionosphere. A part of the atmosphere known as Mesosphere - Lower Thermosphere - Ionosphere (MLTI) also known as MLT region lacked the attention given to other regions like troposphere and stratosphere owing to the difficulties in making direct observations on parameters representing this region and has not been studied extensively in the past. As a consequence even the basic interactive processes between the ionized i.e., the ionosphere and the neutral constituents of MLT region are not very well understood. The MLT dynamics is considerably governed by Solar UV radiation. The Extreme Ultra Violet (EUV) component of solar radiation is primarily absorbed in lower thermosphere and the UV component is absorbed in the mesosphere. A complex web of photochemical and dynamical processes further modulate the upper atmosphere's