An observational study of a magneto-acoustic wave in the solar corona

The Solar Eclipse Corona Imaging System (SECIS) observed a strong 6-s oscillation in an active region coronal loop, during the 1999 August 11 total solar eclipse. In the present paper we show that this oscillation is associated with a fast-mode magneto-acoustic wave that travels through the loop apex with a velocity of 2100 km s-1. We use near-simultaneous SOHO observations to calculate the parameters of the loop and its surroundings such as density, temperature and their spatial variation. We find that the temporal evolution of the intensity is in agreement with the model of an impulsively generated, fast-mode wave.

Determining factors of the innovative behavior of cooperatives: an analysis of the case of Castilla y León

Cooperatives have a long historical experience in the Spanish economy and have demonstrated their ability to compete against traditional firms in the market. To maintain this capability, while taking advantage of the competitive advantages associated with their idiosyncrasies as social economy enterprises, they should take into consideration that the economy is increasingly globalized and increasingly knowledge-based, especially with regards to technological content. As a consequence, the innovative capacity appears to be a key aspect in order to be able to challenge competitors. This article characterizes the innovative behavior of cooperatives in the region of Castile and Leon and analyses the internal and external factors affecting their innovative performance, based on data from a survey of 581 cooperatives. The results of the empirical analysis, which is performed by multivariate binary logistic regression on various types of innovation, lead us to identify the size of the organizations, the existence of planning, the R & D activities and the human capital as the main determining factors.

Highly Ionized sodium X-ray line emission from the solar corona and the abundance of sodium

Context. The X-ray lines between 10.9 and 11.2 Å have attracted little attention but are of interest since they enable an estimate of the coronal abundance of Na to be made. This is of great interest in the continuing debate on the nature of the FIP (first ionization potential) effect. Aims. Observations of the lines with the Solar Maximum Mission Flat Crystal Spectrometer and a rocket-borne X-ray spectrometer are used to measure the Na/Ne abundance ratio, i.e. the ratio of an element with very low FIP to one with high FIP. Methods. New atomic data are used to generate synthetic spectra which are compared with the observations, with temperature and the Na/Ne abundance ratio as free parameters. Results. Temperature estimates from the observations indicate that the line emission is principally from non-flaring active regions, and that the Na/Ne abundance ratio is 0.07 ± 50%. Conclusions. The Na/Ne abundance ratio is close to a coronal value for which the abundances of low-FIP elements (FIP < 10 eV) are enhanced by a factor of 3 to 4 over those found in the photosphere. For low-temperature (Te 1.5 MK) spectra, the presence of lines requires that either a higher-temperature component is present or a revision of ionization or recombination rates is needed.

Search for Rapid Changes in the Visible-Light Corona during the 21 June 2001 Total Solar Eclipse

Some 8000 images obtained with the Solar Eclipse Coronal Imaging System (SECIS) fast-frame CCD camera instrument located at Lusaka, Zambia, during the total eclipse of 21 June 2001 have been analysed to search for short-period oscillations in intensity that could be a signature of solar coronal heating mechanisms by MHD wave dissipation. Images were taken in white-light and Fe xiv green-line (5303 ) channels over 205 seconds (frame rate 39 s(-1)), approximately the length of eclipse totality at this location, with a pixel size of four arcseconds square. The data are of considerably better quality than those that we obtained during the 11 August 1999 total eclipse (Rudawy et al.: Astron. Astrophys. 416, 1179, 2004), in that the images are much better exposed and enhancements in the drive system of the heliostat used gave a much improved image stability. Classical Fourier and wavelet techniques have been used to analyse the emission at 29 518 locations, of which 10 714 had emission at reasonably high levels, searching for periodic fluctuations with periods in the range 0.1 -aEuro parts per thousand 17 seconds (frequencies 0.06 -aEuro parts per thousand 10 Hz). While a number of possible periodicities were apparent in the wavelet analysis, none of the spatially and time-limited periodicities in the local brightness curves was found to be physically important. This implies that the pervasive Alfv,n wave-like phenomena (Tomczyk et al.: Science 317, 1192, 2007) using polarimetric observations with the Coronal Multi-Channel Polarimeter (CoMP) instrument do not give rise to significant oscillatory intensity fluctuations.

Refined Magnetoseismological Technique for the Solar Corona

We present a step-by-step guide of a refined magnetoseismological technique for plasma diagnostics in the Sun’s corona. Recently developed MHD wave theory which models a coronal loop as an expanding magnetic flux tube with an arbitrary longitudinal plasma density profile is applied to TRACE observations of fast kink
oscillations. The theory predicts that using the observed ratio of the first overtone and fundamental mode to predict the plasma density scale height and not taking account of loop expansion will lead to an overestimation of scale height. For the first time, the size of this correction is quantified directly from observation and for the particular case study presented here, it is found that the overestimation is approximately by a factor of 2.

Extraits de divers ouvrages, pour la plupart imprimés.

Contient : Théâtre d'honneur et de chevalerie, par A. Favyn (Paris, 1620 ; in-4° ) ; Coronica general de España, de Pedro Antonio Beuter (Valence, 1604 ; in-fol) ; Chronique d'Alfonse le Sage (Valladolid, 1604) ; Cronica del rey D. Fernando (Valladolid, 1554 ; in-fol) ; Annales de la Corona de Aragon, par Zurita (Saragosse, 1610 ; in-fol) ; Corpus Francicae historiae, de Marquard Freher (Hanau, 1613 ; in-fol) ; Cronica general de la orden de San Benito, par A. Yepez (Valladolid, 1609 et suiv. ; in-fol) ; Cronica del rey D. Jaime I, par Ramon Muntaner (Barcelone, 1562 ; in-fol) ; Cronica del... Cid Ruy Diaz campeador (Medina del Campo, 1552 ; in-fol) ; Cronica del rey D. Sancho il Bravo [Valladolid, 1554 ; in-fol.] ; Historiens espagnols divers ; Rerum Gallicarum commentarii, par François Beaucaire de Peguillon (Lyon, 1625 ; in-fol) ; Lettres de Pierre Martyr (Alcala, 1530 ; in-fol) ; Discorso y allegationes de Decreto, par Pedro Luyz Martinez (Saragosse, 1591) ; Cronica general de España, continuée par Ambrosio Morales (Alcala, 1574 ; in-fol) ; Généalogies extraites des ouvrages de Sandoval ; Cosmographie universelle, de François de Belleforest (Paris, 1575 ; in-fol) ; Extraits des ouvrages d'A. Moralez ; Histoire de saint Hubert, évêque de Liège (d'après un ms. de la Chartreuse de Liège) ; Libro de las grandezas de España, par Pedro de Medina (Alcala, 1595 ; in-fol) ; Lettres de Pierre Martyr ; In obitum incomparabilis Margaritae, illustrissimae Navarrorum reginae, oratio funebris, par Charles de Sainte-Marthe (Paris, 1550 ; in-4° ) ; Tratado comprobatorio del imperio.. que los reyes de Castilla tienen sobre las Indias, par Bartholomeo de las Casas (Séville, 1552 ; in-4°) ; La conveniencia de las dos Monarquias catolicas (Madrid, 1612) ; Histoire de la naissance, progrès et décadence de l'hérésie de ce siècle, par Florimond de Remond (Rouen, 1624)

Identificación del factor inhibidor de la activación de macrófagos presente en el líquido de ascitis del tumor L5178Y por Rebeca Palacios Corona

Tesis (Maestría en Ciencias con Especialidad en Inmunobiología) U.A.N.L.

Autopercepción de cambios en el rol y la dinámica familiar de la mujer profesionista que trabaja [por] Argelia Guadalupe Castilla Canales

Tesis (Maestría en Psicología Social) U.A.N.L.

Elogio funebre del señor don Pedro Ramón Romero de Terreros, Trebuestos, Davalos, Ochoa, y Castilla, conde de Santa María de Regla, que con asistencia del tribunal dixo el día 27 de noviembre de 1809 en la iglesia del convento imperial, de N.P. Santo Domingo.

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Corona fúnebre del esclarecido ciudadano Santos Degollado, Gobernador de Michoacán y de Jalisco

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Corona fúnebre del C. General de Brigada Leandro del Valle, diputado al Soberano Congreso de la Unión por el Estado de Jalisco

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Discurso pronunciado por D. J. M. Gutiérrez de Estrada presidente de la Diputación, el 3 de Octubre de 1863, al ofrecer en el Palacio de Miramar, a nombre de la Asamblea de los Notables de México, La Corona Imperial a S.A.I. y R. el Archiduque Fernando Maximiliano

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