A case of cancellation of magnetic fields is observed during the decay of a small active region. Three different sources of information were simultaneously used...

Observations of the Sun provide unique insights into its structure, evolution, and activity, with significant implications for space weather forecasting and...

Effects of differential extinction across the Earth's atmosphere on astronomical photometry are reviewed. Under the same circumstances when a rotating extended...

A new method has recently been developed to obtain the Fried's parameter from observations of granulation outside the disk center, based on the different...

Low degree l=0-2 solar p-modes were detected with the SLOT instruments at Izana and Baja California. The main source of noise for these ground based...

Since 1984 the measurements of a quadruple photometer sited at the Observatorio del Teide (Izana, Tenerife) made it possible to identify the p-mode luminosity...

Potassium line data from observatories in Hawaii and Spain were used to establish the authenticity of complex solar oscillation signals. Combination of the two...

A new procedure to separate the instrumental and atmospheric components of stray light is presented. It is based on the dependence of the aureole's atmospheric...

The site of the solar spectrometer of the International Research on the Interior of the Sun (IRIS) network, installed in December 1989 in the Teide Observatory...