A rocket‐borne experiment to study the currents associated with a system of multiple auroral arcs was conducted at Poker Flat, Alaska, at 1122 UT on February 2, 1972. The magnetic field in the vicinity of the auroral system was measured with a cesium vector magnetometer. Possible configurations were inferred by constructing model current systems that reproduced the magnetic field variations measured along the flight path. The data are interpreted in terms of a model current system consisting of two eastward electrojets and one westward electrojet and three pairs of oppositely directed Birkeland sheet currents, all lying in a plane approximately parallel to the auroral arcs. Sheet thicknesses ranged from 20 to 60 km and current densities from 10 to 45 µA/m²; the electrojet currents ranged from 1000 to 2000 A. A possible alternate model consisted of four pairs of sheets whose thicknesses range from 10 to 40 km with current densities from 10 to 90 µA/m². There was quite good agreement between the locations of the visual arcs and the upward current sheets. The overall current configuration is discussed in view of the theoretical models constructed by Atkinson and Sato and Holzer and of other observations.
Atacam a, Nord Chili) nÉsuwÉ : Une seconde campagne d'observations a été menée à fin 2005 sur le diapir de sel de la Cordillera de la 5al, sur la bordure ouest du Salar de Atacama, au nord du Chili. Elle faisait suite à une première visite en 1996. Cela nous a permis de constater la lenteur des processus d'érosion dans cette région, l'une des plus arides du globe. Un deuxième réseau de drainage partiellement souterrain a été topographié. Quelques pertes, partiellement obstruées par des dépôts éoliens, ont été relevées.
KARSTOLOGIA no6 -2' semestre 1985 T{ouvelles observations sur l'hydrogéologie de la région entre Arâches et Flaine (Haute-Sovoie) Rësumë : (/ne série de traçoges à I'aide de fluorescéine a été ffictuée en 1983 et lgfa^dgns la,régiol dtt Hau.te*Alneg cal' cores compr$es entre Arâches et la station de Flaine, en Haute' Savoie. Les perles sont situëes soit sur le pourtour des lacs d'origine g{acio-karstique, soit dans le lit des émissaires, à des sltitudes comprises entre 800 et 170A m. Dans tous les cas qui ont été examinés, lu sortie des eaux se fait dans la vallée de l'Arve, ù l'ouest, à I'altitude de 500 m environ. Un cheminement souterrsin possible est proposé, en tendnt compte de la tectonique très faillée de la région. Abstract: NEW HYDROGEOLOGICAL INVESTIGA-TIONS IN THE (MASSIF DE PLATÉ, ngtWEgN ARÂ-CHES AND FLAINE (HAUTE-SAVOIE, FRANCE). During I9B3 and 1984, several dye-tracing experiments have been performed in the French Prealps (Huute-Savoie). The stu-died area covered about 30 km', with altitudes ranging between 500 m and 2500 m. An underground drainage model has been set up, taking into account the fact thot there is a common water outlet. The model is based upon the regional tectonic setting, tlte drainage pattern following thrust and fault planes.
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