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  1. No Access

    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...

    B. Caccin, I. Ermolli, M. Fofi, A. M. Sambuco in Solar Physics (1998)

  2. No Access

    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...

    I. Ermolli, M. Fofi, C. Bernacchia, F. Berrilli, B. Caccin, A. Egidi… in Solar Physics (1998)

  3. No Access

    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...

    I. Ermolli, M. Fofi, C. Bernacchia… in Solar Electromagnetic Radiation Study for … (1998)

  4. No Access

    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...

    B. Caccin, I. Ermolli, M. Fofi… in Solar Electromagnetic Radiation Study for … (1998)

  5. No Access

    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...

    M. Fofi, P. Paolicchi in Il Nuovo Cimento B (1971-1996) (1982)

  6. No Access

    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...

    A. Cacciani, M. Fofi in Solar Physics (1978)

  7. No Access

    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...

    G. Agnelli, A. Cacciani, M. Fofi in Solar Physics (1975)

  8. No Access

    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 ...

    A. Cacciani, M. Fofi in Solar Physics (1971)

  9. No Access

    Chapter

    A Short Report on the Magnetic Beam Absorption Filter Research at the Rome Astronomical Observatory

    Some possible developments of magnetic beam absorption devices are described, in view of their very promising possibilities of practical application in the field of solar magnetic field observations.

    A. Cacciani, M. Cimino, M. Fofi in Solar Magnetic Fields (1971)

  10. No Access

    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:...

    M. Cimino, A. Cacciani, M. Fofi in Solar Physics (1970)