HAO Colloquium Series Presents Serena Criscuoli, NSO

On the contribution of small magnetic elements to solar spectral irradiance 

Facular regions have for long been believed to contribute positively to Total and Spectral Irradiance variations. Recent measurements by the SIM radiometers onboard the SORCE mission, seem to suggest instead a negative contribution at the visible and infrared spectral ranges. Most of the techniques developed so far to reproduce irradiance variations do not support this result, which cast doubts about the reliability of SIM measurements. In this talk I will focus on some theoretical faults of current irradiance modeling, and the difficulties inherent to compare models and observations. Three dimensional Magneto Hydrodynamic simulations of the solar atmosphere seem very promising in improving our capability to reproduce irradiance variations. This approach, though, also poses theoretical and observational challenges which we will have to face in the present and in the near future.

Webcast: https://ucarconnect.ucar.edu/live?room=cg1aud

Date and time: 
Wednesday, September 9, 2015 - 1:30pm to 2:30pm
Building: 
CG1
Room: 
South Auditorium