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Multicomponent He I 10 830 A profiles in an active filament
Sasso, C.,Lagg, A.,Solanki, S.K. EDP Sciences 2011 Astronomy and astrophysics Vol.526 No.1
<P>Aims. We present new spectropolarimetric observations of the chromospheric He I 10 830 angstrom multiplet observed in a filament during its phase of activity. Methods. The data were recorded with the new Tenerife Infrared Polarimeter (TIP-II) at the German Vacuum Tower Telescope (VTT) on 2005 May 18. We inverted the He Stokes profiles using multiple atmospheric components. Results. The observed He Stokes profiles display a remarkably wide variety of shapes. Most of the profiles show very broad Stokes I absorptions and complex and spatially variable Stokes V signatures. The inversion of the profiles shows evidence of different atmospheric blue-and redshifted components of the He I lines within the resolution element (similar to 1 arcsec), with supersonic velocities of up to similar to 100 km s(-1). Up to five different atmospheric components are found in the same profile. We show that even these complex profiles can be reliably inverted.</P>
Recent Developments in Magnetic Measurements
V. Basso,F. Fiorillo,C. Beatrice,A. Caprile,M. Kuepferling,A. Magni,C. P. Sasso 한국자기학회 2013 Journal of Magnetics Vol.18 No.3
We present a few significant advances in methods and concepts of magnetic measurements, aimed both at providing novel routes in the characterization of hard and soft magnetic materials and at improving our basic knowledge of the magnetization process. We discuss, in particular, investigation methods and experimental arrangements that have been developed in recent times for: 1) Hysteresis loop determination in extra-hard magnets by means of Pulsed Field Magnetometry; 2) Broadband observation of domain wall dynamics by highspeed stroboscopical Kerr techniques; 3) Entropy measurements in magnetocaloric materials by calorimetry in magnetic field. While pertaining to somewhat independent fields of investigation, all these measuring techniques have in common a solid approach to the underlying physical phenomenology and have a potential for further developments.