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- W3106227675 abstract "The solar active region photospheric magnetic field evolves rapidly during major eruptive events, suggesting appreciable feedback from the corona. Previous studies of these magnetic imprints are mostly based on line of sight only or lower-cadence vector observations; a temporally resolved depiction of the vector field evolution is hitherto lacking. Here, we introduce the high-cadence (90 s or 135 s) vector magnetogram data set from the Helioseismic and Magnetic Imager, which is well suited for investigating the phenomenon. These observations allow quantitative characterization of the permanent, step-like changes that are most pronounced in the horizontal field component (Bh). A highly structured pattern emerges from analysis of an archetypical event, SOL2011-02-15T01:56, where Bh near the main polarity inversion line increases significantly during the earlier phase of the associated flare with a timescale of several minutes, while Bh in the periphery decreases at later times with smaller magnitudes and a slightly longer timescale. The data set also allows effective identification of the magnetic transient artifact, where enhanced flare emission alters the Stokes profiles and the inferred magnetic field becomes unreliable. Our results provide insights on the momentum processes in solar eruptions. The data set may also be useful to the study of sunquakes and data-driven modeling of the corona." @default.
- W3106227675 created "2020-11-23" @default.
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- W3106227675 date "2017-04-17" @default.
- W3106227675 modified "2023-09-27" @default.
- W3106227675 title "Investigating the Magnetic Imprints of Major Solar Eruptions with<i>SDO</i>/HMI High-cadence Vector Magnetograms" @default.
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- W3106227675 doi "https://doi.org/10.3847/1538-4357/aa69c1" @default.
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