Institutos Universitarios


Brief description:

Space technology is a critical subject for the everyday life and security of European citizens. The goal of the work of the UCM Group of Ionospheric Studies and Global Navigation Satellite Systems (GNSS), Ref. 910596, is to study some of the key questions involved in space weather analysis from solar energetic phenomena to their effects on space technology by using a broad and interdisciplinary collaboration. The main objective is to reduce the vulnerabilities of Global Navigation Satellite Systems (GNSS), (space and ground segments) and spacecraft due to space environment events.

The ionosphere is the main threat to the reliable and safe operation of GNSS and to other electromagnetic signals operating below 10 GHz as HF and satellite communications, remote sensing and Earth observation systems. This influence becomes much more critical in bad space weather conditions. For this reason increasing the knowledge of both the structure and the variability of the ionosphere is an important task in the development of the applications of positioning and navigation.

In low magnetic latitudes the Appleton Anomaly induces irregularities in the post-sunset F-layer like Plasma Bubbles, as it has been reported by the UCM group (Portillo et al., 2008; Magdaleno et al. 2012). These plasma depletions degrade electromagnetic signal propagation and can produce GNSS signal fast amplitude and phase variations, known as scintillation, loss of tracking lock in the receiver, cycle slips, etc. These perturbations can produce as much as 100 m of error in positioning under extreme conditions. Low latitude scintillation has seasonal variability and mainly occurs at night time hours.


Aims of the program:

  1. To establish a comprehensive catalogue of major disturbances for solar cycle 23 and 24 classified according to their impact on space assets.

  2. To evaluate the Ionospheric anomalies by studying the TEC and its Rate of Change (ROT).

  3. To identify the triggering values for selected terrestrial disturbances related to CHAR-Risk events.

  4. To develop software tools to analyze the Rinex Files given by permanent GNSS stations for obtaining TEC values and their rate of change (ROT). An Euler-Goad model adapted to process multi-system and multi-frequency GNSS observations will be used.

  5. To produce outreach and educational material for increasing public awareness of solar activity and the vulnerability of society to space weather.