Can a Halo CME from the limb be geoeffective?

The probability for a halo coronal mass ejection (CME) to be geoeffective is assumed to be higher the closer the CME launch site is located to the solar central meridian. However, events far from the central meridian may produce severe geomagnetic storms, like the case in April 2000. In this work, we study the possible geoeffectiveness of full halo CMEs with the source region situated at solar limb. For this task, we select all limb full halo (LFH) CMEs that occurred during solar cycle 23, and we search for signatures of geoeffectiveness between 1 and 5 days after the first appearance of each CME in the LASCO C2 field of view. When signatures of geomagnetic activity are observed in the selected time window, interplanetary data are carefully analyzed in order to look for the cause of the geomagnetic disturbance. Finally, a possible association between geoeffective interplanetary signatures and every LFH CME in solar cycle 23 is checked in order to decide on the CME's geoeffectiveness. After a detailed analysis of solar, interplanetary, and geomagnetic data, we conclude that of the 25 investigated events, there are only four geoeffective LFH CMEs, all coming from the west limb. The geoeffectiveness of these events seems to be moderate, turning to intense in two of them as a result of cumulative effects from previous mass ejections. We conclude that ejections from solar locations close to the west limb should be considered in space weather, at least as sources of moderate disturbances.

La mineralització kàrstica (Ba,Cu,Pb,Zn,Sb) de Rocabruna i de Can Pubill, Pirineo Oriental: geologia, morfologia i gènesi

La mineralització consisteix en el rebliment de cavitats mètriques de morfologia kàrstica, encaixades en dolomies Cambro-Ordovicianes. Les cavitats són plenes de baritina amb una aurèola centi a mil·limètrica de quars i sulfurs (tetraedrita-tennantita, calcopirita, galena, esfalerita). La mineralització és situada a prop i per sota d'una paleosuperficie sobre la qual es depositaren els red-beds, amb disseminacions de baritina, de fàcies garumniana (Cretaci superior-Paleocè). Les condicions de deposició son coherents amb una precipitació a partir de solucions, inicialment àcides, que omplien cavitats preexistents.

Models d'interpretació de la cançó tradicional catalana per part dels mestres especialistes de música a l'escola primària

Aquest treball de recerca, realizat amb mestres especialistes de música de l'etapa primària, exposa diversos models d'interpretació de la cançó, prèvia exposició dels diversos elements que en configuren el caràcter.

Can we identify Walrasian allocations?

[eng] We consider a discrete time, pure exchange infinite horizon economy with two or more consumers and at least one concumption good per period. Within the framework of decentralized mechanisms, we show that for a given consumption trade at any period of time, say at time one, the consumers will need, in general, an infinite dimensional (informational) space to identigy such a trade as an intemporal Walrasian one. However, we show and characterize a set of enviroments where the Walrasian trades at each period of time can be achieved as the equilibrium trades of a sequence of decentralized competitive mechanisms, using only both current prices and quantities to coordinate decisions.

Miquel Àngel Riera's The Unattainable Gods (Els déus inaccessibles), or why can Platonic Western world not restore Paganism?

The aim of this article is to read accurately the novel by M. A. Riera from the point of view of the Classical Tradition and, specifically, from the perspective of the evident Platonic tradition ¿the most metaphysical Platonic love- upon which it is based. In the author¿s opinion, only this accurate reading makes us understand why certain values coming from Paganism and which were considered as such cannot be restored by the Platonic Western world.

"Maurice" de James Ivory . ¿Traición a la Tradición Clásica al adaptar la novela de E. M. Forster?

De acuerdo con los estudios sobre literatura y cine y desde el punto de vista de la influencia de la Tradición Clásica -Tradición Griega Clásica, en este caso-, este artículo es un análisis minucioso de las traiciones inevitables ¿hasta un cierto punto- de los guionistas a los textos literarios que adaptan. Sin embargo, a pesar de ser prácticamente inevitable, el Dr. Pau Gilabert Barberà indica cuáles son en su opinión los límites más allá de los cuales Ivory/Hesketh-Harvey no deberían haber ido a fin de no diluir el temperamento helénico de "Maurice" de E. M. Forster.