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DIAS effective sunspot number as an indicator of the ionospheric activity level over Europe

Tsaqouri I., Zolesi B., Cander L.R., Belehaki A.

Acta Geophysica

2010

Vol. 58, no. 3

491-512

DIAS (European Digital Upper Atmosphere Server) effective sunspot number - R12eff was recently introduced as a proxy of the ionospheric conditions over Europe for regional ionospheric mapping purposes. Although a pre-processing step for the real-time update of the Simplified Ionospheric Regional Model (SIRM) to real-time conditions, R12eff is available in real time by DIAS system (http://dias.space.noa.gr) for independent operational use. In this paper we discuss the efficiency of R12eff to specify ionospheric conditions over Europe. For this purpose, the diurnal R12eff's reference pattern was determined on monthly basis and for different solar cycle phases. The deviation of the real-time R12eff estimates from the reference values, R12eff was found to be highly correlated with the foF2 storm-time disturbances, especially during large scale effects indicating that DIAS-R12eff can provide a reliable estimator of the ionospheric activity level over a substantial part of Europe and a powerful tool for ionospheric specification applications.

Ionospheric trough in GPS signal

Świątek A.

Acta Geophysica

2008

Vol. 56, no. 4

1162-1178

The article presents research conducted by means of the GPS technique through TEC (Total Electron Content) computation for individual satellites. The proposed method makes it possible to investigate small ionospheric structures. For strong ionospheric disturbances, at high and middle latitudes, one can observe a ionospheric trough shift towards the lower latitudes. The results presented in this paper were obtained for strong disturbances observed in October 2003. The paper shows a comparison for chosen quiet and strongly disturbed days. To avoid differences caused by changing position of the Sun (seasonal zenith angle changes), all the analysed information was related to the same period of time.