| Sumario: | The Latin American Giant Observatory (LAGO) is an extended cosmic ray observatory operating in nine Latin American countries. Within the LAGO framework, several scientific and academic programs are being developed and conducted. One of them, the LAGO Space Weather program, aims at producing real time, high resolution and high quality data of the flux of secondary particles at each site of the LAGO detection network, complementing and expanding present measurements of the influence of solar activity from ground level observations. With the LAGO detection network, transient events or long term modulation effects can be measured simultaneously at places having different geomagnetic rigidity cut-offs and atmospheric reaction levels. As the data acquisition system of LAGO registers the individual energy of all secondaries detected, these transients can furthermore be studied in different energy bands. This program is intensively supported by a complex chain of simulations that accounts for geomagnetic and atmospheric effects and the different detectors response. In this work, the complete simulation chain is described, and the first multi-spectral analysis of the Forbush decrease of March of 2012 is presented.
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