Center for Astrophysics Research and Technologies Seminar Series
Solar Flares in the Extreme Ultraviolet
Presented by Rachel Hock-Mysliwiec, AFRL
The Extreme UltraViolet (EUV, 10-121 nm) irradiance from solar flares is a critical driver of short term variability in the Earth's upper atmosphere. Since 2010, the EUV Variability Experiment (EVE) onboard NASA's Solar Dynamics Observatory (SDO) has observed numerous solar flares. A key observation from EVE is that one subset of flares exhibits an additional enhancement of the 2-3 million K emission several hours after the flare's soft X-ray emission. From the Atmospheric Imaging Assembly (AIA, also onboard SDO) images, we observe that this secondary emission, dubbed the EUV late phase, occurs in the same active region as the flare but not in the same coronal loops. In this talk, I will present an overview of recent observations of solar flares in the EUV, discuss the origin of the EUV late phase and the development of the Air Force Flare Irradiance Model as well as initial results showing its ability to predict the irradiances for a diverse range of flares. I will also describe preliminary efforts to drive the model with parameters derived from images of the flaring region instead of EUV lightcurves.
2:00 pm, Thursday, September 29, 2016
PAIS-2540, PAIS
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