Understanding The Extreme Ultraviolet Irradiance Evolution Of Long Duration Events Using Data From Solar Dynamics Observatory (SDO) Extreme Ultraviolet Variability Experiment (EVE)

Astronomy and Astrophysics – Astronomy

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Since its launch on 11 February 2010, NASA's Solar Dynamic Observatory (SDO) has observed numerous solar flares. Between 1 May 2010 and 31 March 2011, the Extreme ultraviolet Variability Experiment (EVE) captured over 350 C-class, 43 M-class, and 2 X-class events. Long duration events or flares lasting more than one hour are of particular interest because they release a large amount to energy over a long time and are often associated with filament eruptions, large coronal mass ejections and dimmings in certain EUV lines such as Fe IX (17.1 nm). In these long duration events, the EUV irradiance from 2-3 MK emission can peak up to a hour after the GOES soft x-ray peak. In this work, we present observations of several long duration events and look at the correlation between the duration of the flare and the delay in EUV emission.

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