出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Cosmic ray intensity at Earth changes with time and presents variations associated with the 11- yr solar cycle, with interplanetary coronal mass ejections (ICME) arriving on the Earth’s magnetosphere, and with energetic particles produced during large solar flares. Studies also show that the cosmic rays can be related with atmospheric phenomena. Since cosmic rays are the main source of ionization between ~4 and ~60 km, they may influence climate phenomena as global cloud coverage and rain precipitation rate. Meteorological and atmospheric processes, such as changes in the ambient pressure and temperature, rain precipitation and variations of the atmospheric electric field can affect the cosmic ray counts observed by ground based detectors. In this work we present the results obtained with the CARPET charged particle detector installed at Astronomical Complex El Leoncito (CASLEO) in San Juan - Argentina, since April 2006. We show and discuss the long term modulation of the cosmic ray flux associated with solar phenomena, like the 11-yr solar cycle and seasonal variations that can be related to changes in the atmospheric temperature. We also correct cosmic ray data for the barometric effect in order to discuss short time increases of the cosmic ray intensity in association to rain precipitation and changes in the atmospheric electric field.
