ANÁLISE DE EMISSÕES SOLARES MÉTRICAS COM LENTA TAXA DE DERIVA EM FREQUÊNCIA ASSOCIADAS À EVAPORAÇÃO CROMOSFÉRICA

Abstract

By computational tools exclusively developed for the extraction and analysis of solar data obtained by spectrometers from the e-Callisto network, the analysis of a solar radio-emission recorded in metric wavelengths (200 800 MHz) on August 9th, 2011 (~ 08: 32 UT), was performed. The generated dynamic spectrum of the solar emission clearly demonstrates the presence of a slow frequency drift rate, an indication of a front of upward expansion of heated plasma, which characterizes the chromospheric evaporation phenomenon. From the spectral data, an adjustment function for the relationship between frequency and time was obtained by linear regression and a drift rate at the frequency of 1.14 MHz / s was determined. Thus, the speed of the heated plasma expansion front was estimated at 99.1 km/s (for the lower corona) and 369.6 km/s (for the upper corona), adopting an electronic density model for the region of emission in the solar corona. These values are comparable with results obtained in the literature, confirming that the radio emission represents a signature in metric waves of the phenomenon of chromospheric evaporation. Finally, 1 Graduando em Engenharia da Computação pela Universidade do Vale do Paraíba (UNIVAP), E-mail: anrobits@yahoo.com.br. 2 Doutor em Ciência Espacial. Docente no Instituto Federal de Educação, Ciência e Tecnologia de São Paulo Campus São José dos Campos (IFSP-SJC), E-mail: francisco.fernandes@ifsp.edu.br.