Forbush decrease on September 6-13, 2017 observed by the Tanca water-Cherenkov detector
Loading...
Date
2021-05-07
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Solar activity was intense in September 2017 and its effects were observed in different detectors
placed at the Earth’s surface. Three halo Coronal Mass Ejections (CME) hit the planet and caused
magnetic storms. The effects of the CMEs on the flux of galactic cosmic rays at ground level
were observed by the Tanca detector, which is one of the water-Cherenkov detectors (WCD) that
make up the Latin American Giant Observatory (LAGO). In this paper we present the detection of
Forbush events observed by Tanca during the month of September 2017. This WCD is installed
on the campus of the University of Campinas, in Brazil, having three photomultiplier tubes that
detect Cherenkov photons produced by cosmic radiation in 11400 liters of ultra pure water. We
present the description and performance of the experimental apparatus and the observation on
days 6th, 8th and 13th of the Forbush events originated by the CMEs. A decrease in the cosmic
rays flux due to a stream inTeraction region was also observed on 14th September. These results
were compared with observations made by neutron monitors and indices of the Earth’s magnetic
activity.