THERMAL DIAGNOSTICS WITH THE ATMOSPHERIC IMAGING ASSEMBLY ON BOARD THE SOLAR DYNAMICS OBSERVATORY: A VALIDATED METHOD FOR DIFFERENTIAL EMISSION MEASURE INVERSIONS

By Mark C. M. Cheung, P. Boerner, C. Schrijver, P. Testa, Feng Chen, H. Peter, A. Malanushenko. 2015

164 citations recorded by the source corpus.

We present a new method for performing differential emission measure (DEM) inversions on narrow-band EUV images from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. The method yields positive definite DEM solutions by solving a linear program. This method has been validated against a diverse set of thermal models of varying complexity and realism. These include (1) idealized Gaussian DEM distributions, (2) 3D models of NOAA Active Region 11158 comprising quasi-steady loop atmospheres in a nonlinear force-free field, and (3) thermodynamic models from a fully compressible, 3D MHD simulation of active region (AR) corona formation following magnetic flux emergence. We then present results from the application of the method to AIA observations of Active Region 11158, comparing the region's thermal structure on two successive solar rotations. Additionally, we show how the DEM inversion method can be adapted to simultaneously invert AIA and Hinode X-ray Telescope data, and how supplementing AIA data with the latter improves the inversion result. The speed of the method allows for routine production of DEM maps, thus facilitating science studies that require tracking of the thermal structure of the solar corona in time and space.

Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/898a139d85a1701af83e6b45d3b3e4deb9efc54c

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In Astronomy and Astrophysics

1. Matthias Rempel
2. Xin Cheng
3. M. Ding
4. Paul Charbonneau
5. Mark S. Miesch
6. J. Toomre
7. A. Brun
8. M. Browning

In Statistical and Nonlinear Physics

1. Mark S. Miesch
2. J. Toomre
3. A. Brun

Citations in the corpus

• Observations of Turbulent Magnetic Reconnection within a Solar Current Sheet (2018, methodology): “We also take advantage of other two inversion methods independently developed by Hannah & Kontar (2012) and Cheung et al. (2015), respectively.”
• EXTENSION OF THE MURAM RADIATIVE MHD CODE FOR CORONAL SIMULATIONS (2016, background): “This is due to the confinement of hot loops to lower heights (Chen et al. 2015; Cheung et al. 2015), where they connect to regions with enhanced Poynting flux at the periphery of the spots.”