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Geofísica internacional
versión On-line ISSN 2954-436Xversión impresa ISSN 0016-7169
Geofís. Intl vol.44 no.2 Ciudad de México abr./jun. 2005
Artículos
GPS-derived total electron content response for the Bastille Day magnetic storm of 2000 at a low mid-latitude station
1CIRES-University of Colorado SEC-NOAA 325 Broadway R/SEC, Boulder, CO 80305 Email: Eduardo.Araujo@noaa.gov
First steps toward the development of a vertical Total Electron Content (VTEC) storm-time correction empirical ionospheric model, equivalent to the STORM model for the peak concentration of the F2 region (Araujo-Pradere and Fuller-Rowell, 2002, Araujo-Pradere et al., 2002), are currently in progress in the NOAA's Space Environment Center (SEC). The program to obtain VTEC, the SEC's Win TEC Project (Anghel and Codrescu, 2002), use the RINEX (Receiver Independent Exchange for-mat) files to derive the vertical TEC from the delay of the Global Position System (GPS) signals.
With a maximum Dst of -287.6 (maximum ap = 400), the storm of July 2000, known as the Bastille Day storm, has been one of the most intense perturbations in the present solar cycle. The response of the TEC at a low mid-latitude station, as obtained from the delay in code and phase of the GPS signals, is analyzed for this storm. The vertical TEC at ccv3 (Cape Canaveral, Florida, latitude 28.46 N, longitude 279.45 E) suffered a sudden increase, over 250% with respect to quiet conditions, for the first day of the storm, followed by a sharp negative gradient, and a slow recovery. The picture is further complicated by the presence of very steep gradients, responsible for the degradation of the GPS positioning accuracy.
KEYWORDS: Ionosphere; magnetic storms; TEC; GPS
El desarrollo de un modelo empírico para la corrección de la predicción por modelos climatológicos del Contenido Total Electrónico vertical (VTEC), equivalente al modelo STORM para el pico de concentración de la capa F2 (Araujo-Pradere y Fuller-Rowell, 2002, Araujo-Pradere et al., 2002), se encuentra ahora en su etapa inicial en el Space Environment Center (SEC) de NOAA. El programa para la obtención del TEC, el proyecto Win Tec (Anghel y Codrescu, 2002), utiliza los archivos de formato de intercambio independiente del receptor (RINEX) para derivar el TEC vertical a partir del retraso de las señales del Sistema de Posicionamiento Global (GPS).
Con un valor máximo del Dst de -287.6 (máximo ap = 400), la tormenta de julio 2000, conocida como la tormenta del Día de la Bastille, ha sido una de las más intensas perturbaciones en el ciclo solar actual. En este trabajo se analiza la respuesta del TEC, obtenido del retardo que sufren el código y la fase de la señal de GPS a su paso por la ionosfera, para la tormenta de julio 2000. Los valores de TEC vertical en la estación receptora ccv3 (Cabo Cañaveral, Florida, latitud 28.46 N, longitud 279.45 E) sufrieron un súbito incremento, más del 250% con respecto a los días tranquilos previos, seguido por un fuerte gradiente negativo, y una lenta recuperación. El cuadro es aun más complejo por la presencia de estos gradientes, responsables por la degradación de la calidad del posicionamiento obtenido por GPS.
PALABRAS CLAVES: Ionosfera; tormentas magnéticas; TEC; GPS
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Received: July 22, 2003; Accepted: August 13, 2004
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