Improved measurements of the photospheric and chromospheric three-dimensional magnetic and flow fields are crucial for a precise determination of the origin and...
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PublicationFlow and magnetic field properties in the trailing sunspots of active region NOAA 12396
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PublicationFragments in sunspots
High-resolution white light and H-alpha observations are used to study the development of 15 large active solar regions. The behavior of the magnetic fragments...
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PublicationFragments in sunspots.
The following are the main findings: (1) Fragments with typically 1021Mx preserve their identity and even survive to the decay of the sunspots. (2) Each...
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PublicationGranulation deformation near and in sunspot regions
High-resolution white-light pictures are analyzed to study the differences between the granular size near sunspot penumbrae and in light-bridges presenting...
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PublicationHeat transfer in sunspot penumbrae. Origin of dark-cored penumbral filaments
Context: Observations at 0.1 arcsec have revealed the existence of dark cores in the bright filaments of sunspot penumbrae. Expectations are high that such dark...
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PublicationHeight Dependence of the Penumbral Fine-scale Structure in the Inner Solar Atmosphere
We studied the physical parameters of the penumbra in a large and fully developed sunspot, one of the largest over the last two solar cycles, by using full...
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PublicationHeight variation of the cutoff frequency in a sunspot umbra
Context. In the solar atmosphere, the acoustic cutoff frequency is a local quantity that depends on atmospheric height. It separates low-frequency evanescent...
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PublicationHelioseismic holography of simulated sunspots: dependence of the travel time on magnetic field strength and Wilson depression
Improving methods for determining the subsurface structure of sunspots from their seismic signature requires a better understanding of the interaction of waves...
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PublicationHelioseismic Holography of Simulated Sunspots: Magnetic and Thermal Contributions to Travel Times
Wave propagation through sunspots involves conversion between waves of acoustic and magnetic character. In addition, the thermal structure of sunspots is very...