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Enhancing the Solar Physics Applications for the Solar Extreme Ultraviolet (EUV) Spectral Irradiance Observations from the SDO EUV Variability Experiment (EVE)

Presentation #108.07 in the session Instrumentation and Data Center Posters.

Published onSep 18, 2023
Enhancing the Solar Physics Applications for the Solar Extreme Ultraviolet (EUV) Spectral Irradiance Observations from the SDO EUV Variability Experiment (EVE)

The solar extreme ultraviolet (EUV) spectral irradiance includes a few continua and many emission features from the chromosphere, transition region, and corona. The Solar Dynamics Observatory (SDO) EUV Variability Experiment (EVE) has been observing the solar EUV spectral irradiance since May 2010 over the range from 6 nm to 106 nm and with 0.1 nm spectral resolution. The solar EUV irradiance spectra, as well as the irradiances of several emission features and broad bands, are provided in the EVE Level 2 data product for its measurement cadence of 10 s and also in its Level 3 product for the daily averaged results. The original analysis for identifying which emission features to include in the EVE data products used CHIANTI version 6 to evaluate the relative magnitude of the blended lines from multiple elements and to select the least-blended features for the EVE data product. With significantly larger atomic database and other improvements now included in CHIANTI version 10, and with 12 years of EVE solar observations, a fresh evaluation of the emission feature blends as a function of plasma temperature has been done. The EVE data product Version 8 is being updated to include additional emission features, as well as to provide line profile information and to separate the emission features from the continua. These improvements enable more detailed analysis of Doppler shifts and elemental abundance changes that can give physical insight into the processes for flare eruptions and active region evolution. Examples of these analyses and application for solar physics are presented.

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