The Cassini spacecraft, launched in October 1997 and expected to reach Saturn in 2004, carries two magnetometer experiments on a 10-m boom, one at the mid-section of the boom and the other situated at the end of the boom. In order to gather valid scientific magnetic field data and avoid electromagnetic interference, the spacecraft had to comply with stringent magnetostatic cleanliness requirements. This paper describes the results of the Cassini magnetics cleanliness program that achieved the goal of minimizing the magnetic field interference with Cassini's DC magnetic field science instruments.

The five identical THEMIS Spacecraft, launched in February 2007, carry two magnetometers on each probe, one DC fluxgate (FGM) and one AC search coil (SCM). Due to the small size of the THEMIS probes, and the short length of the magnetometer booms, magnetic cleanliness was a particularly complex task for this medium sized mission. The requirements leveled on the spacecraft and instrument design required a detailed approach, but one that did not hamper the development of the probes during their short design, production and testing phase. In this paper we describe the magnetic cleanliness program's requirements, design guidelines, program implementation, mission integration and test philosophy and present test results, and mission on-orbit performance.

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ResumenEn este artículo se presenta y discute la experiencia de la Dirección de Educación Virtual de la Universidad Tecnológica de Bolívar en Cartagena de Indias, Colombia, sobre el uso de Tecnologías de la Información en la enseñanza y formación de profesionales. En particular se discute la experiencia lograda con el desarrollo y uso del Sistema de aprendizaje Virtual Interactivo (SAVIO), como una herramienta base del modelo pedagógico que permitió flexibilizar los procesos de enseñanza-aprendizaje en el sistema presencial de la universidad. A través de los años el uso de SAVIO como plataforma virtual se ha extendido y ha permitido el desarrollo de nuevas aplicaciones y métodos para la enseñanza., transformándose en un programa exitoso que puede ser replicado en otras instituciones.. Palabras clave: software libre, educación virtual, herramientas, construcción de contenidos, TIC Use of Free Software for the Development of Teaching Material AbstractThe experience of the Dirección de Educación Virtual de la Universidad Tecnológica de Bolívar en Cartagena de Indias, Colombia on the use of information technology in teching and formation of professionals is analyzed and discussed. In particular the experience achieved with the development and use of the Interactive Virtual Learning System (SAVIO), as the main tool for a new teaching model that allowed changes in the traditional teaching-learning process with the presence of the instructor and the students. Through the years the use of SAVIO has extended and has allowed new applications and new teaching methods, becoming a successful experience that could be replied in other institutions.

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