Atmospheric-ionospheric disturbances in the MLT region during convective climate: an integrated approach

• Ano de defesa: 2015
• Autor(a) principal: Babu Ram Tiwari
• Orientador(a): Esfhan Alam Kherani, Eurico Rodrigues de Paula
• Banca de defesa: Delano Gobbi, Daiki Koga, Nanan Balan, Paulo Alexandre Bronzato Nogueira
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Instituto Nacional de Pesquisas Espaciais (INPE)
• Programa de Pós-Graduação: Programa de Pós-Graduação do INPE em Geofísica Espacial/Ciências do Ambiente Solar-Terrestre
• País: BR
• Link de acesso: http://urlib.net/sid.inpe.br/mtc-m21b/2015/11.16.12.31

The Mesosphere-Lower-Thermosphere (MLT) region of the atmosphere in the 70-140 km altitude hosts varieties of atmospheric-ionospheric disturbances, owing to its coupling with the lower atmosphere through the acoustic-gravity waves (AGWs). These waves are launched during the tropospheric convection involving convective instability (CI) which is a key process during the convective climate in determining the meteorological and weather conditions. The objective of my thesis is to develop an integrated theoretical framework that includes cause and effects from troposphere to MLT region. This objective will be pursued by addressing three topics: (1) Troposphere convection dynamics, (2) Generation and propagation of AGWs arising from the convection, and (3) Subsequent atmospheric-ionospheric disturbances (AIDs) in the MLT region. In the first step, I propose to develop a new simulation model for the tropospheric convection that includes the diabatic and adiabatic dynamics desired during weak and strong environmental lapse rates. In the second step, the AGWs model developed by Kherani et al. (2012) will be integrated with the first step. In the third step, an ionospheric model will be developed and integrated with the first two steps. With this integrated model, I propose to study the following aspects: (i) CI associated lapse rate variation in the troposphere, (ii) simulation of OH airglow ripples and descending sodium (Na) density quasi-periodic (QP) disturbances in the MLT region, (iii) simulation of QP disturbances in the lower and upper E region, (iv) QP disturbances in the electrojet. All these aspects will be examined for the tropical/equator-low-latitude atmosphere-ionosphere and the simulation results will be compared with the observations from previous studies.