The Salinity Multi-band Thematic Maps generated by the correlations between the superficial in situ data and the “simultaneous” remote Landsat data (MSS and TM) are obtained for three seasons: Summer 1981, Summer 1987 and Winter 1988-89. The water body under…

La cuenca de agua subterránea de San Juan Londó está situada al norte de La Paz, Baja California. Se efectuó una prospección magnética terrestre para definir la geometría y los limites estructurales de la cuenca. En un total de 173…

Hydrographic data from a meridional section in the equatorial zone are used to estimate geostrophic currents and their associated errors. The geopotential field is smoothed out using orthogonal polynomials. The first and second derivatives are calculated and used to evaluate…

With the support of the Chilean Antartic Institute (I.N.A.Ch.) the galactic and the solar cosmic-ray radiation will be monitored during the early nineties on King George Island. The continuous registrations of a 6 - NM - 64 detector will be…

During the ascending solar-activity phase of Schwabe cycle N.22 eleven ground-level enhancements (GLEs) have been registered by the ground-based network of cosmic-ray detectors. They are: July 25, August 16, September 29, October 19, 22 and 24, November 15, 1989 and…

During the interval of August 16,1978 – December 28, 1979, 90% of the intense geomagnetic storms (Dst < -100nT) were precede by the arrival of interplanetary fast forward shocks at 1AU, as identified with magnetic field and plasma data collected…

Based on the calculation of average N(h) profiles, experimental results from 4 months of minimum and 4 months of maximum solar activity were compared with the modelling predictions from the “International Reference Ionosphere” (IRI). The IRI models reasonably the region…

Mineralogical and geochemical data from pre-caldera lavas of Volcan Fuego de Colima indicate that both fractional crystallization and mixing processes occurred together. Three types of mixing are evidenced: (i): Mixing between fresh input of mafic magma and olivine-clinopyroxene cumulates in…

We report Sr, Nd and Pb isotopic compositions and trace element data on calc-alkaline andesites from Volcán Colima and compare them with other volcanic centers of the Mexican Volcanic Belt. The chondrite-normalized REE patterns of Colima andesites show LREE-enrichment with…

The use of satellite data in combination with ground-based measurements can provide valuable information about atmospheric chemistry and air quality. In this study, ground-based Differential Optical Absorption Spectroscopy (DOAS) measurements of nitrogen dioxide (NO2) conducted in central Mexico are compared…