| Grant number: | 17/01332-8 |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| Start date: | April 01, 2017 |
| End date: | June 30, 2017 |
| Field of knowledge: | Physical Sciences and Mathematics - Geosciences - Geophysics |
| Principal Investigator: | Inez Staciarini Batista |
| Grantee: | Láysa Cristina Araújo Resende Chagas |
| Supervisor: | Jens Wickert |
| Host Institution: | Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovação (Brasil). São José dos Campos , SP, Brazil |
| Institution abroad: | Helmholtz Centre Potsdam (GFZ), Germany |
| Associated to the scholarship: | 14/11198-9 - Analysis of the Disturbed Electrical Fields Effects in the Sporadic Layers on Equatorials and Low Latitude Regions, BP.PD |
Abstract It has been well accepted that the Es layer formation occurs due to wind shear mechanisms in which metallic ions converge into a thin layer by the wind action in opposite directions. Although many works have already been published in the literature analyzing the theoretical mechanisms and observational data of the Es layers formation, some questions about how tidal winds, planetary waves, and gravity waves influence the Es layer have yet to be answered. The candidate has been improving a previous version of a theoretical model for the E region (MIRE - Carrasco et al., 2007) that is capable of simulating the Es layer dynamics considering the influence of winds and electric fields for low and equatorial regions. Up to now, the model has been solely validated by comparing the simulated results with the data obtained from the Brazilian digisondes. However, some discrepancies between simulated and observational data have been found, such as: the Es layer downward movement discrepancies, the Es layer disruption/formation under the influence of disturbed electric fields, and minor mismatches in the Es layer densities. It turns out that the data available at INPE will not be capable to provide enough information to fine tune MIRE. Hence, it is not currently possible to verify what physical behaviors must be improved in the simulations so that the results can be more realistic. There are some other methods that can improve the level of information about the Es layer at our region of interest, but the most promising seems to be the data obtained from radio occultation measurements of the global navigation satellite systems (GNSS). This data can be related to the Es layer density using a technique developed at Helmholtz Centre Potsdam, which can provide enough information to validate and improve MIRE simulations. Thus, it is proposed in this 3-month project to perform a comparative study of our simulation results with the aforementioned satellite measurements at the institute that developed the technique. This will provide a better understanding about Es layer dynamics in equatorial and low latitude regions, and will greatly improve the accuracy of MIRE, which is an interesting topic in the scientific community. (AU) | |
| News published in Agência FAPESP Newsletter about the scholarship: | |
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