Solar magnetic fields measurements with a magneto-optical filter

Summary The presence of a magnetic field at different levels inside the Sun has crucial implications for helioseismology. The solar oscillation observing program carried out since 1983 at Mt. Wilson with Cacciani magneto-optical filter (MOF) has recently been modified to acquire full-disk magnetograms with 2 arcsec spatial resolution. We present here a method for the correct determination of magnetic maps which are free of contamination by velocity signal. We show that no cross-talk exists between the Doppler and Zeeman shifts of the NaD lines, provided that instrumental polarization effects are taken into account. We also used the observed line-ofsight photospheric field to map the vector field in the inner corona, above active regions, in the ?current free? approximation.

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Riassunto La presenza di un campo magnetico a differenti livelli dell'interno solare ha importanti implicazioni nell'eliosismologia. Il programma osservativo a Mt. Wilson, in corso dal 1983 con il filtro magneto-ottico di Cacciani, è stato recentemente arricchito con l'acquisizione anche di mappe magnetiche. Si illustra la procedura di riduzione dei dati per una corretta determinazione dei campi magnetici e di velocità. Viene poi utilizzato il campo longitudinale fotosferico per ricostruire il campo magnetico vettoriale a livello coronale, al di sopra delle regioni attive, nell'approssimazione ?current free?.

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Резюме Налччие магнитного поля на различных уровнях внутри Солнца имеет существенное значение для гелиосейсмологии. Программа наблюдения солнечных осцилляций, проводимая с 1983 года на г. Вильсон с помощью магнитно-оптического фильтра, была недавно модифицирована. В этой работе мы предлагаем метод для определения магнитных карт, которые свободны от погрешностей, обусловленных сигналом скорости. Мы показываем, что при учете инструментальных эффектов поляризации, не существует связи между доплеровским и зеемановским сдвигами линий NaD. Мы также используем наблюдаемое поле фотосферы для отобразения векторного поля во внутренней короне, выше, активных областей.

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Paper presented at the 4th Cosmic Physics National Conference, Capri, September 11–14, 1988.

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To speed up publication, the proofs were not sent to the authors and were supervised by the Scientific Committee.     

The A(y) problem for p-3He elastic scattering

We present evidence that numerically accurate quantum calculations employing modern internucleon forces do not reproduce the proton analyzing power, A(y), for p- 3He elastic scattering at low energies. These calculations underpredict new measured analyzing powers by approximately 30% at E(c.m.) = 1.20 MeV and by 40% at E(c.m.) = 1.69 MeV, an effect analogous to a well-known problem in p-d and n-d scattering. The calculations are performed using the complex Kohn variational principle and the (correlated) hyperspherical harmonics technique with full treatment of the Coulomb force. The inclusion of the three-nucleon interaction does not improve the agreement with the experimental data.     

Laser removal of mold growth from paper

Femtosecond laser nano-processing by enhanced light scattered from nanospheres has received much attention. Enhanced scattered near field enables us to ablate nanoholes at nanometer scales below the diffraction limit. In addition, the interference between the scattered far field and the irradiated laser enables us to fabricate spatially controlled periodic surface structures. In this paper, we simulated the time evolution of scattered near field and far field during the free electron excitation in silicon (Si) by femtosecond laser irradiation. The optical property of Si changes from dielectric to metal-like Si due to the increase of the free electron number density excited by femtosecond laser pulse. It is elucidated that the scattered field of Si shifts from Mie scattering to plasmonic scattering during laser irradiation. We achieved the optimal free electron density and laser intensity for precisely controlled periodic surface structures fabrication. We explained the temporal behavior of the scattering near field and far field from the standpoint of dielectric function of the materials.     

Lowest-order and hyper-netted-chain calculations of nuclear matter

Employing two model central interactions the binding energy of nuclear matter is calculated within the framework of the Jastrow variational approach using different types of constrains and including all the contributions from hypernetted-chain diagrams.