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Emerging dimmings of active regions observed by SDO
Jun Zhang, Shuhong Yang, Yang Liu +1
With the observations from the Atmospheric Imaging Assembly and the Helioseismic and Magnetic Imager aboard the \emph{Solar Dynamics Observatory}, we statistically investigate the…
Full-disk nonlinear force-free field extrapolation of SDO/HMI and SOLIS/VSM magnetograms
Tilaye Tadesse, T. Wiegelmann, B. Inhester +3
Extrapolation codes in Cartesian geometry for modelling the magnetic field in the corona do not take the curvature of the Sun's surface into account and can only be applied to rela…
A Non-radial Eruption in a Quadrupolar Magnetic Configuration with a Coronal Null
Xudong Sun, Todd Hoeksema, Yang Liu +2
We report one of several homologous non-radial eruptions from NOAA active region (AR) 11158 that are strongly modulated by the local magnetic field as observed with the Solar Dynam…
Nonlinear force-free field modeling of a solar active region using SDO/HMI and SOLIS/VSM data
J. K. Thalmann, A. Pietarila, X. Sun +1
We use SDO/HMI and SOLIS/VSM photospheric magnetic field measurements to model the force-free coronal field above a solar active region, assuming magnetic forces to dominate. We ta…
Properties of high-frequency wave power halos around active regions: an analysis of multi-height data from HMI and AIA onboard SDO
S. P. Rajaguru, S. Couvidat, Xudong Sun +2
We study properties of waves of frequencies above the photospheric acoustic cut-off of 5.3 mHz, around four active regions, through spatial maps of their power estimated u…
How to optimize nonlinear force-free coronal magnetic field extrapolations from SDO/HMI vector magnetograms?
T. Wiegelmann, J. K. Thalmann, B. Inhester +3
The SDO/HMI instruments provide photospheric vector magnetograms with a high spatial and temporal resolution. Our intention is to model the coronal magnetic field above active regi…