Statistical characterization of strong and mid solar flares and sun EUV rate monitoring with GNSS

摘要

The global network of permanent Global Navigation Satellite Systems (GNSS) receivers has become an useful and\udaffordable way of monitoring the Solar EUV flux rate, especially -for the time being- in the context of Major and\udMid geoeffective intensity Solar Flares (M. Hernandez-Pajares et al., SpaceWeather, doi:10.1029/2012SW000826,\ud2012). In fact the maturity of this technique (GNSS Solar FLAre Indicator, GSFLAI) has allowed to incorporate\udit in operational real-time (RT) conditions, thanks to the availability of global GNSS datastreams from the RT\udInternational GNSS Network (M. Caissy et al, GPS World, June 1, 2012), and performed in the context of the\udMONITOR and MONITOR2 ESA-funded projects (Y. Beniguel et al., NAVITEC Proc., 978-1-4673-2011-5\udIEEE, 2012).\udThe main goal of this presentation is to summarize a detailed recent study of the statistical properties of\udSolar Flares (E. Monte and M. Hernandez-Pajares, J. Geophys. Res., doi:10.1002/2014JA020206, 2014) by\udconsidering the GNSS proxy of EUV rate (GSFLAI parameter) computed independently each 30 seconds during\udthe whole last solar cycle. An statistical model has been characterized that explains the empirical results such\udas (a) the persistence and presence of bursts of solar flares and (b) their long tail peak values of the solar flux\udvariation, which can be characterized by: (1) A fractional Brownian model for the long-term dependence, and (2),\uda power law distribution for the time series extreme values.\udFinally, an update of the Solar Flares’ occurrence during the recent months of Solar Activity, gathered in\udRT within MONITOR2 project, will close the paper.