IBIS (Interferometric BIdimensional spectrometer)

IBIS is a new instrument for solar bidimensional spectroscopy, now under construction at the Arcetri Astrophysical Observatory. It essentially consists of two Fabry-Perot interferometers, piezo-scanned and capacity servo-controlled, which are used in classic mount and in axial-mode, in series with a narrow-band interference filter. This instrument will operate on a large field of view (80����) and on a large wavelength range (5800–8600 ˚A), with high spectral (λ/Δλ � 250000), spatial (�0.2) and temporal (� 5 frames s−1) resolution. When completed in 2002, it will be one of the leading instruments for solar research, well suited for a new generation telescopes such as THEMIS

Image acquisition system for the Italian panoramic monochromator of the THEMIS telescope

We describe the image acquisition system of the italian panoramic monochromator which will be in operation at the focus F2 of the THEMIS solar telescope to acquire images of the Sun in the visible spectrum (between 420 and 700 nm) with a spectral resolving power of about 300 000. The system consists of two CCD cameras (using either 512-512 or 1024- 1024 square-pixel sensors) controlled and readout by dedicated electronics and a personal computer. The data transmission between the sensors and the computer is performed by means of an optical link

Magnetic field experiment Pioneers 6, 7 and 8

Magnetometer systems on Pioneers 6, 7, and 8 to study interplanetary magnetic field

Magnetic field hourly averages from the Rome-GSFC experiment aboard Helios 1 and Helio 2

Plots of all the hourly averages computed from the solar magnetic field measurements obtained during the mission are given separately for Helios 1 and Helios 2. The magnitude and the direction of the averaged field are plotted versus the number of solar rotations as seen from Helios, counted from launch