Infrastructure or equipment

TOMographic IONosphere (TOMION-v1) model: Multi-layer voxel defined electron density description obtained from GPS (and more recently multi-GNSS) dual-frequency carrier phase measurements only, directly processed in a Kalman filter able to run in real-time at global scale (very first version presented in Hernández-Pajares et al., 1999). TOMION-v1 is working in the background on a daily basis to generate the quarter-of-an-hour-time-resolution Rapid Global ionospheric map (UQRG) model. The "UQRG" Global Ionospheric Map (GIMs) is presently the slightly better behaving GIM among the ones produced by the 8 ionospheric analysis centers contributing to the International GNSS Service (IGS) --see for instance (Roma-Dollase et al. 2018)--. UQRG GIM is computed on a daily basis with latencies of 1-2 days (hereinafter "rapid"), from dual-frequency GNSS carrier phase data only, by solving a two-layer voxel model in a Kalman filter, and interpolating the resulting Vertical Total Electron Content (VTEC) values with Kriging (Hernández-Pajares et al. 1999, Orus et al. 2005). They are provided following the IGS standards, with a resolution of 15 min. x 5 deg. x 2.5 in time, longitude and latitude in IONEX format (Schaer et al. 1998), among complementary material such as movies, at ftp://ionsat2.upc.edu/upc_ionex/, which is linkable from future PITHIA-NRF web interface (UPC).

TOMION-v2 is continuously working in the background to update the experimental real-time ionospheric global electron content model every 30 seconds, providing interpolated global VTEC GIM every 15 minutes (provisional Id. "USRG", see validation details in Liu et al. 2020), with a spatial resolution of 5 deg. x 2.5 in longitude and latitude in IONEX format. This is provided in http://chapman.upc.es/tomion/real-time/quick/last_results/, linkable from future PITHIA-NRF web interface, including as well VTEC plot and animation since last midnight and the distribution of active stations (UPC).

SOLar Euv Flux RAte (SOLERA, formerly known as GSFLAI) model, and SOLERA-drift and the Sunlit Ionosphere Sudden TEC Enhancement Detector (SISTED) indices: proxies of EUV solar flux rate thanks to a simple but realistic first-principles based SOLERA model of the overionization generated in the ionosphere (Hernández-Pajares et al. 2012b, Singh et al. 2015). And the associated indices of solar flares occurrence SOLERA-drift and SISTED obtained from GNSS measurements taken from the overall daylight ionosphere (Hernández-Pajares et al. 2012b), has been applied to study the statistics of the repeatability time (Monte & Hernández-Pajares 2014). They are presently distributed through https://swe.ssa.ionsat.upc.es requiring an user id and password, in the context of SSA EC research program (UPC).