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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PublicationCircular polarization of the CA II H and K lines in solar quiet and active regions
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PublicationComparison of parameters of low l solar p-modes at maximum and minimum activity
Velocity measurements of disk integrated sunlight obtained by GOLF experiment aboard SOHO are used to find the parameters of solar p-modes (l
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PublicationContinuum intensity and magnetic flux of solar fluxtubes
The continuum contrast between flux tubes and their quiet background, and the magnetic flux carried by these magnetic elements, have been determined at...
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PublicationDecay rates of sunspot groups from 1874 to 1976
The global behavior and fine structure of the distribution of sunspot decay rates from activity cycle 13 to 20 are presented. It is shown that the distribution...
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PublicationDetailed processes accompanying the decay of an active region
The decay of a small solar active region is studied with high-resolution magnetograms. The reduction process made it possible to match intensity and magnetic...
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TalkDynamos, the drivers of solar and stellar activity
Following Cowling's anti-dynamo theorem of 1933, there was a long period during which the very existence of dynamos was unclear. Even with the emergence of...
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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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PublicationFrequency shift of solar p-modes as seen by cross correlation analysis
Data obtained at the Observatorio del Teide (Tenerife) during the years 1978 to 1988 using a resonant scattering spectrophotometer, is analyzed to look for...
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PublicationInstability and eruption of magnetic flux tubes in the solar convection zone
We present a consistent model of storage, instability and dynamical eruption of magnetic flux tubes in the solar convection zone and underlying overshoot region...