Entropy variation studies on physical quantities measured in the solar wind

• Grant number: 16/25563-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2017
• End date: February 28, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences
• Principal Investigator: Arian Ojeda González
• Grantee: Matheus Guilherme Anjos de Souza
• Host Institution: Instituto de Pesquisa e Desenvolvimento (IP&D). Universidade do Vale do Paraíba (UNIVAP). São José dos Campos , SP, Brazil

Abstract

This research project will introduce a technique used to identify possible candidate regions to have an interplanetary magnetic cloud (MC). The term "magnetic cloud" is used to describe a large-scale interplanetary structure shaped as a flux-rope which is inside a coronal mass ejection. The project uses data from the three components of the interplanetary magnetic field with a temporal resolution of sixteen seconds that is measured by the ACE satellite. These data will be processed and, using the Visual Recurrence Analysis software, the spatio-temporal entropy (STE) will be calculated to derive an entropy index that will show itself as time series, which will only have values lower than 1.5% for regions with the presence of these clouds. The aim of this paper is the study of entropy values of a long period of data in the interplanetary magnetic field. The candidate will work with three more methods used to calculate the entropy of a time series, and these methods are: 1) Spectral Entropy, 2) Recurrence Period Density Entropy e 3) Shannon information entropy of Recurrence quantification analysis. Also, the candidate will have to compare the results and propose methodological bases to further create an automatic identification technique of MCs, which may be useful for space weather studies. (AU)