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...
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...
Free space experimental characterization of a multilayer Fabry-Pérot resonator for DALI
The axion is a long-postulated boson that can simultaneously solve two crucial problems of Modern Physics: the unexpected charge and parity symmetry observed in...
Freeform active mirror designed for additive manufacturing
A possible answer to the challenge brought by the construction of the next generation 40 m-class telescopes was the case study of FAME (Freeform Active Mirror...
Frequencies and oscillation modes of variable stars in σ Orionis and NGC 6811
We study photometric variable stars in two open clusters of very different age: σ Orionis (τ ˜ 3 Ma, d ˜ 385 pc) and NGC 6811 (τ ˜ 600 Ma, d ˜ 1000 pc). In NGC...
Frequencies and splittings of low-degree acoustic modes: a comparison between MDI and GOLF observations
During the years 1996 through 1998 the MDI and GOLF experiments on the SOHO mission have provided unique and nearly uninterrupted sequences of helioseismic...