IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Determination of the mass of CMEs from the analysis of EUV dimmings
Autor/es:
FERNANDO MARCELO LÓPEZ; FEDERICO NUEVO; HEBE CREMADES; ALBERTO VÁSQUEZ; LAURA BALMACEDA
Lugar:
Buenos Aires
Reunión:
Congreso; COLAGE XI - Eleventh Latin American Conference on Space Geophysics; 2018
Resumen:
Coronal mass ejections (CMEs) are one of the most spectacular transient events that can be observed in the solar atmosphere. Under certain conditions these events can perturb the Earth´s magnetosphere, producing intense geomagnetic storms. For this reason, a more accurate determination of fundamental parameters of CMEs, such as their mass, iscrucial to estimate their impact on our planet. Unfortunately, the determination of CME masses when the events propagate along the observer´s line-of-sight involve large errors, both due to the nature of the Thomson scattering effect and to the lack of knowledge of the density distribution within real CMEs. In this work, we analyzed 32 EUV dimming events for which we determined the temporal evolution of the mass loss, as well as the evolution of the mass of the associated CMEs. The mass loss from the dimmings was determined applying a Differential Emission Measure (DEM) technique on data obtained by the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory. The mass of the associated CMEs is determined from white-light images by the coronagraph COR2 onboard the Solar-Terrestrial Relations Observatory. By combining both analyses, we developed a method to estimate the evolution of the mass of CMEs as a function of height. This method is solely based on the evacuated mass determined from EUV images, and does not rely on white-light coronagraphic data. To validate our method, the results are contrasted against the mass of CMEs measured from COR2 quadratureimaging.