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Ensemble Kalman Filter Data Assimilation Into Surface Flux Transport Model To Infer Surface Flows: An Observing System Simulation Experiment
Soumyaranjan Dash, Marc L. DeRosa, Mausumi Dikpati +4
Knowledge of the global magnetic field distribution and its evolution on the Sun's surface is crucial for modeling the coronal magnetic field, understanding solar wind dynamics, co…
Large Photospheric Doppler Shift in Solar Active Region 12673: I. Field-Aligned Flows
Jiayi Liu, Xudong Sun, Peter W. Schuck +3
Delta () sunspots sometimes host fast photospheric flows along the central magnetic polarity inversion line (PIL). Here we study the strong Doppler shift signature in the centra…
Limitations and biases in the retrieval of the polar magnetic field I: the role of the magnetic filling factor in Milne-Eddington inversions of simulated Hinode/SP data
Rebecca Centeno, Ivan Milić, Matthias Rempel +2
We study the extent to which Milne-Eddington inversions are able to retrieve and characterize the magnetic landscape of the solar poles from observations by the spectropolarimeter…
Removal Of Active Region Inflows Reveals a Weak Solar Cycle Scale Trend In Near-surface Meridional Flow
Sushant S. Mahajan, Xudong Sun, Junwei Zhao
Using time-distance local helioseismology flow maps within 1 Mm of the solar photosphere, we detect inflows toward activity belts that contribute to solar cycle scale variations in…
On the nature of photospheric horizontal magnetic field increase in major solar flares
Lijuan Liu, Zhenjun Zhou, Yuming Wang +2
Rapid increase of horizontal magnetic field () around the flaring polarity inversion line is the most prominent photospheric field change during flares. It is considered to be…
A New Magnetic Parameter of Active Regions Distinguishing Large Eruptive and Confined Solar Flares
Ting Li, Xudong Sun, Yijun Hou +3
With the aim of investigating how the magnetic field in solar active regions (ARs) controls flare activity, i.e., whether a confined or eruptive flare occurs, we analyze 106 flares…