Cosmic ray survey between latitudes 38 o N and 53 o S along the Atlantic Ocean

TRISTAN (TRasgo para InveSTigaciones ANtarticas) is a cosmic ray detector of the TRASGO family. The detector has been installed at the Spanish Antarctic Base in Livignston Island, as one of the detectors of ORCA (Antarctic Cosmic Ray Observaroty) in December 2019. TRISTAN detector collected data during three journeys crossing the Atlantic Ocean between latitudes 38oN and 53oS on board of the Sarmiento de Gamboa and BIO Hesperides oceanographic vessels. The trips took place between November 2018 and December 2019. The main purpose is to evaluate the capability of a TRASGO detector to explore the geomagnetic field variations and the different atmospheric behaviours at both hemispheres and in the Equator region. Themain technical aspects of the detector and its performance (efficiency, resolutions, and acceptances) will be discussed and the preliminary results of the last journey will be presented.