A
Alessandro Cacciani
Researcher at Sapienza University of Rome
Publications - 59
Citations - 919
Alessandro Cacciani is an academic researcher from Sapienza University of Rome. The author has contributed to research in topics: Helioseismology & Solar rotation. The author has an hindex of 13, co-authored 59 publications receiving 875 citations.
Papers
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Journal ArticleDOI
Magnetoacoustic Portals and the Basal Heating of the Solar Chromosphere
Stuart M. Jefferies,Scott W. McIntosh,James D. Armstrong,T. J. Bogdan,T. J. Bogdan,Alessandro Cacciani,Bernhard Fleck +6 more
TL;DR: In this paper, inclined magnetic field lines at the boundaries of large-scale convective cells (supergranules) provide "portals" through which low-frequency (5 mHz) acoustic waves, which are believed to provide the dominant source of wave heating of the chromosphere, are used to balance the radiative losses of the ambient solar chromosphere.
Journal ArticleDOI
An instrument to observe low-degree solar oscillations
TL;DR: In this article, a two-beam Doppler imager based on a magneto-optical filter was used to measure the frequency splitting of the low-degree modes in order to determine the rotation rate of the solar core.
Journal ArticleDOI
Helioseismic Mapping of the Magnetic Canopy in the Solar Chromosphere
Wolfgang Finsterle,Stuart M. Jefferies,Stuart M. Jefferies,Alessandro Cacciani,P. Rapex,Scott W. McIntosh +5 more
TL;DR: In this article, the authors determine the topology of the magnetic canopy in and around active regions by mapping the propagation behavior of high-frequency acoustic waves in the solar chromosphere.
Journal ArticleDOI
The Magneto-Optical Filter. II. Velocity Field Measurements
Alessandro Cacciani,M. Fofi +1 more
TL;DR: In this paper, a filter which utilizes magneto-optical effects for velocity field measurements is described and the working principle of the instrument is described, and its transmission profiles are given.
Journal ArticleDOI
The magneto-optical filter
TL;DR: In this article, the authors showed that a magneto-optical filter with a very narrow passband (less than 30mA) and a very high transmission (up to nearly 100% apart from losses arising from the glass cell, lenses and polarizers) is possible.