Solar flares monitor with Fermi-LAT

Fermi-LAT is performing an all-sky γ -ray survey from 20 MeV to > 300 GeV with unprecedented sensitivity and angular resolution. Fermi is the only mission able to detect high energy ( > 40 MeV ) emission from the Sun during the new solar cycle 24. Fermi was launched in June 2008, and since then the high energy emission from the Sun was continuously monitored searching for flare events. Upper limits were derived for all the solar flares detected by other missions and experiments (RHESSI, Fermi-GBM, GOES). We present the analysis techniques used for this study and the preliminary results obtained in the first months of this search.