Preliminary results of refined site analysis for the Antarctic node of the Latin American Giant Observatory

A.M GULISANO; S. DASSO; O. ARESO; M. PEREIRA

Chiang Mai

Workshop; Fourth Workshop of the SCAR AAA; 2017

The analysis of the site atmospheric profile at the upper layers of the troposphere for the upcoming Antarcticnode at Marambio Station of the LAGO Collaboration (Latin American Giant Observatory) has been conducted toassess the perturbation expected at intense geomagnetic storms and its consequence for the cosmic rayssimulations. These results will help to improve the accuracy of the cosmic rays numerical simulations and tounderstand the expected behavior of the particle fluxes once the node is operative. The climatology of thetemperature and pressure height profiles at Marambio (from ground up to 35km height) have been characterizedusing balloon soundings (from 1998 up to 2016) removing the 14 days span around the geomagnetic storm event.Then the profiles before and after the event were studied to find if there were a departure from the expectedclimatology at different seasons. Our preliminary results indicate that at the day of the geomagnetic storm and up 7days later, layers above 20 km tend to cool in summer while in winter the effect is similar but around 20 km, belowthat height there is no significative effect. Improvements on the water Cherenkov detector design will be alsopresented based on simulation expected performance.