HAO Colloquium - Alberto Sainz Dalda, BAERI

Recovering thermodynamics in the chromosphere from IRIS Mg II h&k lines with IRIS2

IRIS has observed the chromosphere and high photosphere with the optically thick Mg II h&k lines since July 2013. In this talk we present IRIS2 (IRIS-squared), an inversion code based on the inversion of representative profiles with STiC code. The latter considers non-LTE, 1.5D geometry, and partial frequency redistribution, and it is the best available method to recover thermodynamics variables from these spectral lines. We will show the conceptual foundations and limitations of IRIS2. We will explain the different elements of the IRIS2 framework: the representative profiles, the representative model atmospheres, and the representative response functions. Thus, these elements are the largest database of chromospheric thermodynamics models. We will also show how to invert IRIS Mg II h&k data with IRIS2, and how to interpret their results and uncertainties. Although this code has been specifically designed for IRIS Mg II h&k lines, its  concepts can be apply to other spectro(polatimetric) data that may require large computational resources.


Room Number: 

Type of event:

Will this event be webcast to the public by NCAR|UCAR?: 
Calendar Timing: 
Wednesday, October 23, 2019 - 11:00am to 12:00pm MDT

Posted by Sheryl Shapiro at ext. 1567, sheryls@ucar.edu

Quick Facts

NCAR is managed by the nonprofit University Corporation for Atmospheric Research on behalf of NSF and the UCAR university community.

  • NCAR is not a federal agency and its employees are not part of the federal personnel system.
  • Our activities complement those of the federal agencies and we work closely with them.

More about us