Analysis of atmospheric pressure and temperature effects on cosmic ray measurements

• Autores: De Mendonça, R. R. S.; Raulin, J. P.; Echer, E.; Makhmutov, V. S.; Fernandez, German Enzo Leonel
• Año de publicación: 2013
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: COSMIC RAYS; PRESSURE EFFECT ON COSMIC RAYS; TEMPERATURE EFFECT ON COSMIC RAYS
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

In this paper, we analyze atmospheric pressure and temperature effects on the records of the cosmic ray detector CARPET. This detector has monitored secondary cosmic ray intensity since 2006 at Complejo Astronómico El Leoncito (San Juan, Argentina, 31S, 69W, 2550m over sea level) where the geomagnetic rigidity cutoff, Rc, is ~9.8 GV. From the correlation between atmospheric pressure deviations and relative cosmic ray variations, we obtain a barometric coefficient of ?0.440.01 %/hPa. Once the data are corrected for atmospheric pressure, they are used to analyze temperature effects using four methods. Three methods are based on the surface temperature and the temperature at the altitude of maximum production of secondary cosmic rays. The fourth method, the integral method, takes into account the temperature height profile between 14 and 111 km above Complejo Astronómico El Leoncito. The results obtained from these four methods are compared on different time scales from seasonal time variations to scales related to the solar activity cycle. Our conclusion is that the integral method leads to better results to remove the temperature effect of the cosmic ray intensity observed at ground level.
Fil: De Mendonça, R. R. S.. National Institute for Space Research. Division of Space Geophysics; Brasil;
Fil: Raulin, J. P.. Universidade Presbiteriana Mackenzie; Brasil;
Fil: Echer, E.. National Institute for Space Research. Division of Space Geophysics; Brasil;
Fil: Makhmutov, V. S.. Russian Academy of Sciences. Lebedev Physical Institute; Rusia;
Fil: Fernandez, German Enzo Leonel. Consejo Nacional de Invest.cientif.y Tecnicas. Ctro Cientifico Tecnologico Conicet - San Juan. Complejo Astronomico;