Masías Meza, Jimmy J. (2011) Estudios de actividad solar mediante modulación de rayos cósmicos galácticos. / Solar activity studies through the modulation of galactic cosmic rays. Maestría en Ciencias Físicas, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
Los rayos cósmicos galácticos (GCRs) representan muestras que transportan información de regiones remotas del medio interplanetario (a través de la intensidad y dirección de flujo por ejemplo) y una medida indirecta de ello es la lluvia de partículas secundarias producidas en la interacción de los GCRs con la atmósfera. Recientemente, en el observatorio Pierre Auger se ha implementado un mecanismo de detección (modo "Geiger") para partículas que son moduladas por las condiciones de medio interplanetario. Iniciamos la presentación de este trabajo relatando aspectos generales asociados a la modulación solar de GCRs desde su ingreso a la Heliósfera hasta su detección en la órbita terrestre, así como fenómenos típicos durante periodos de alta actividad solar. En el Capítulo 2, caracterizamos el transporte de partículas cargadas (que arrivan a la ubicación del observatorio Pierre Auger) dentro de la magnetósfera para condiciones normales y de tormenta geomagnética. En el Capítulo 3, presentamos un análisis de la respuesta de los scalers (flujo de secundarios detectados en el modo “Geiger") usando métodos de umbral fijo y dinámico con los detectores de superficie del observatorio Pierre Auger. Comparando con datos del Monitor de neutrones de Roma, encontramos que los de umbral dinámico responde mejor ante cambios bruscos del ujo de secundarios. En el Capítulo 4, exploramos el análisis de decrecimientos Forbush mediante espectros Wavelet para determinar los tiempos de recuperación (aún en situaciones donde no es posible determinarlos con métodos ordinarios) estableciendo niveles de confianza que nos permita ver características verdaderas de las series temporales involucradas. Por último, aplicamos éste método para una selección especial de nubes magnéticas (MC) asociadas a decrecimientos Forbush.
Resumen en inglés
The Galactic Cosmic Rays (GCRs) can be used as proxies for the interplanetary conditions (e.g. through the intensity and direction of the ux); an indirect measurement of this, are the Extensive Air Showers developed when a GCR interacts with the Earth atmosphere. Recently, in the Pierre Auger observatory has been implemented a \Geiger" mode, oriented for the detection of particles modulated by the interplanetary conditions. We begin the presentation of this work by introducing general facts associated with GCR solar modulation from their entry to the Heliosphere to their detection in Earth orbit, as well as describing typical phenomena during periods of high solar activity. The results of Chapter 2 characterize the transport of charged particles (arriving to the Pierre Auger observatory location) inside the magnetosphere during calm and geomagnetic storm conditions. In Chapter 3, we present an analysis showing the response of the scalers ( ux of secondary particles detected in the \Geiger" mode) to methods of xed and dynamic thresholds with the surface detectors of the Pierre Auger observatory. By comparing with Rome Neutron Monitor data, we found that those of dynamic threshold have better response to the changes in the ux of secondary particles. In Chapter 4, we explore an analysis of Forbush Decreases (FD) by Wavelet spectra to determine the recovery times (even in situations when ordinary methods are not appliable) by establishing condence levels that allows us to highlight true features of the signals. Finally, we apply this method to a special selection of Magnetic Clouds (MC) associated with Forbush Decreases.
| Tipo de objeto: | Tesis (Maestría en Ciencias Físicas) |
|---|---|
| Palabras Clave: | Solar activity; Actividad solar; Forbush decrease; Decrecimiento de forbush; Cosmic rays; Rayos cósmicos |
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| Materias: | Física > Astrofísica |
| Divisiones: | Investigación y aplicaciones no nucleares > Física > Partículas y campos |
| Código ID: | 315 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 24 Abr 2012 10:26 |
| Última Modificación: | 24 Abr 2012 10:26 |
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