![Loading...](https://link.springer.com/static/c4a417b97a76cc2980e3c25e2271af3129e08bbe/images/pdf-preview/spacer.gif)
-
Article
Variations of the Chromospheric Network with the Solar Cycle
We have digitized a small sample of Caii K spectroheliograms from the photographic archive of Arcetri Observatory for the period 1950–1970. For each digitized plate, active regions have been automatically iden...
-
Article
The Prototype RISE-PSPT Instrument Operating in Rome
The breadboard prototype of the PSPT (Precision Solar Photometric Telescope), built by NSO at Sacramento Peak, has been operating in Rome since February 1996 to test observing procedures and future network ope...
-
Chapter and Conference Paper
The Prototype RISE-PSPT Instrument Operating in Rome
The breadboard prototype of the PSPT (Precision Solar Photometric Telescope), built by NSO at Sacramento Peak, has been operating in Rome since February 1996 to test observing procedures and future network ope...
-
Chapter and Conference Paper
Variations of the Chromospheric Network with the Solar Cycle
We have digitized a small sample of Ca II K spectroheliograms from the photographic archive of Arcetri Observatory for the period 1950–1970. For each digitized plate, active regions have been automatically ide...
-
Article
Effect of the magnetic pressure on cloud evolution
The effect of the magnetic pressure on gravitational collapse leading to star formation is analysed for a wide range of masses and initial values of the temperature and of the field. The collapse time increase...
-
Article
The magneto-optical filter
In this paper we describe a filter which utilizes magneto-optical effects for velocity fields measurements. The working principle of the instrument is described and its transmission profiles are given. Velocit...
-
Article
The magneto-optical filter
Transmission curves and theoretical calculi of the magneto-optical filter, designed and built by the authors, are shown together with some observed transmission spectra. At present the filter has a total halfw...
-
Article
A complete Stokes-meter
A new polarimeter is described which allows the simultaneous determination of the four Stokes parameters analysing the electric signal both in frequency and phase. The signal consists of two frequencies ...
-
Article
Some developments of the magnetic beam absorption filter
In the present paper some experimental arrangements are shown which utilize the magnetic filter described by Cimino et al. (1968). For a single cell we have elaborated an elementary theory in the following cases:...