HAO Research Highlights

SDO/AIA 171Å sub-fields
September 14, 2016

The Interface Region Imaging Spectrograph (IRIS) provides an unparalleled opportunity to explore the (thermal) interface between the chromosphere, transition region, and the coronal plasma observed by the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO).

Poloidal and toroidal magnetic fields
September 8, 2016

We implement an Ensemble Kalman Filter procedure using the Data Assimilation Research Testbed for assimilating "synthetic" meridional flow-speed data in a Babcock–Leighton-type flux-transport solar dynamo model.

Stokes profiles of the Mg II h–k doublet
August 31, 2016

We developed a numerical code for polarized radiative transfer in a plane-parallel geometry that implements a recent formulation of partially coherent scattering by polarized multi-term atoms in arbitrary magnetic field regimes.

Downscaling simulation of gravity waves
August 15, 2016

National Center for Atmospheric Research Whole Atmosphere Community Climate Model (WACCM) with ≈0.25 degree horizontal resolution can resolve gravity waves with horizontal scales down to ≈250 km.

August 8, 2016

We perform the first ever global-scale, altitude-dependent analysis of polar ionospheric conductivity variability using spectrally-resolved in-situ satellite particle measurements.  Our results show that height-integrated conductance and height-dependent conductivities are distinctly different.