To investigate the location of the actual limit for the different behavior, the active regions with fluxes greater than 10 to the 20 Mx are investigated. After...
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PublicationAre the small active regions related to the decay of the larger ones?
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PublicationAutomatic log spectrum restoration of atmospheric seeing
This paper presents an automatic method for (1) digital estimation of the width of the atmospherical seeing in astronomical images of extended objects and (2)...
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PublicationChromospheric polarity reversals on sunspots. Are they consistent with weak line emission?
Photospheric and chromospheric solar magnetograms sometimes show opposite polarity. This intriguing phenomenon is associated with the emergence of magnetic flux...
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PublicationChromospheric Resonances above Sunspots and Potential Seismological Applications
Oscillations in sunspot umbrae exhibit remarkable differences between the photosphere and chromosphere. We evaluate two competing scenarios proposed for...
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PublicationCircular polarization of the CA II H and K lines in solar quiet and active regions
A representative set of profiles is presented for the Ca II H resonace line in Stokes V and I, for the quiet sun, plages, sunspot umbrae, and a flare, as well...
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PublicationCold, Supersonic Evershed Downflows in a Sunspot
We report here on the discovery of supersonic Evershed downflows in the penumbra of a sunspot. These flows are shown to occur along spatially unresolved, very...
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PublicationCombining magneto-hydrostatic constraints with Stokes profiles inversions. II. Application to Hinode/SP observations
Context. Inversion techniques applied to the radiative transfer equation for polarized light are capable of inferring the physical parameters in the solar...
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PublicationCombining magnetohydrostatic constraints with Stokes profiles inversions. I. Role of boundary conditions
Context. Inversion codes for the polarized radiative transfer equation, when applied to spectropolarimetric observations (i.e., Stokes vector) in spectral lines...
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PublicationConverging Flows in the Penumbra of a δ Sunspot
Doppler velocities in the penumbra of a δ-configuration sunspot observed near the limb indicate flows that converge upon the line separating locally positive...