Global electron content: a new conception to track solar activity
By E. Afraimovich, Elvira Astafyeva, A. Oinats, Y. Yasukevich, I. Zhivetiev. 2008
190 citations recorded by the source corpus.
We developed a method and programs for estima- tion of the global electron content (GEC) from GPS measure- ments, using the ionosphere models IRI-2001 and NeQuick. During the 23rd cycle of solar activity, the value of GEC varied from 0.8 to 3.2◊10 32 electrons, following changes in the solar extreme ultra violet (EUV) radiation and solar ra- dio emission at 10.7-cm wavelength. We found a strong re- semblance of these variations, with discernible 11-year and 27-day periodicities. A saturation effect of GEC is found when F10.7 increases. We found that GEC is characterized by strong seasonal (semiannual) variations with maximum relative amplitude at about 10% during the rising and falling parts of the solar activity and up to 30% during the period of maximum. It was found that the relative difference between model and experimental GEC series increase as the smooth- ing time window decreases. We found that GEC-IRI seasonal variations are out-of-phase with experimental GEC values. The lag between model and experimental maximum of GEC values can reach several tens of days. The variations of GEC lag, on average, 2 days after those of F10.7 and UV. GEC completely reflects the dynamics of the active regions on the solar surface. The amplitude of the 27-day GEC variations decreases from 8% at the rising and falling solar activity to 2% at the maximum and at the minimum. We also found that the lifetime of contrast long-living active formations on the Sun's surface in EUV range for more than 1 month exceeds the one in radio range (10.7 cm).
Subfields: Astronomy and Astrophysics, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/4717e0dc28d77e0c7522ba295107786880c4e2f1
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Citations in the corpus
- Climatology of the mean total electron content derived from GPS global ionospheric maps (2009, methodology): “If carefully checked previous results of the ionosphere [e.g., Afraimovich et al., 2008 ] and the thermosphere, such as the total neutral density from CHAMP observations [Liu et al., 2005], we can also draw the similar conclusion.”
- A review of GPS/GLONASS studies of the ionospheric response to natural and anthropogenic processes and phenomena (2013, background): “Only on 13 December at 03.34 UT, short-term failures of L1 and C1 at GPS-GLONASS frequencies were recorded.”
- Atmosphere-ionosphere response to the M9 Tohoku earthquake revealed by multi-instrument space-borne and ground observations: Preliminary results (2011, methodology): “We made four types of analysis: a./ Differential maps; b./ Global Electron Content (GEC) calculations [Afraimovich et al., 2008]; c./ Determination of ionospheric anomaly local character; and d./ Variation of GPS TEC in the IONEX grid point [Pulinets et al. 2004] closest to the Tohoku earthquake…”