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Optimum solar proxy for long-term ionospheric investigations
Jan Lastovicka - Institute of Atmospheric Physics, Czech Academy of Sciences
The problem of optimum solar proxy is important for long-term and/or climatological studies of ionospheric parameters as well as for modeling. I focus on possibly different optimum solar proxies for different ionospheric parameters, as they are affected by partly different spectral ranges of solar ionizing radiation. I use yearly average values of foF2 and foE of four European stations with long (1976-2014) and high-quality data (Juliusruh, Pruhonice, Rome, Slough/Chilton), and the global total electron content (G-TEC). Four solar proxies are used: F10.7, Mg II, solar Lyman-alpha flux Fα and sunspot numbers R. The most important finding is that the optimum solar proxies are different for different ionospheric parameters. The most suitable solar proxy for foF2 is found to be Mg II, whereas for foE F10.7 evidently outperforms Mg II. Fα and sunspot numbers perform slightly worse but none of four solar proxies performs poorly. F10.7 is favored for G-TEC, to some extent surprisingly, as previous results favored rather Mg II. However, also Fα and R provide results which are not significantly worse than those based on F10.7 and Mg II.
16 July 2020
Abstract submission opens:
16 July 2020
European Space Weather Medals:
6 September 2020
25 September 2020
Registration deadline: [extended]
10 October 2020
Abstract submission deadline:
4 September 2020