Solar Activity Indices for Ionospheric Parameters in the 23rd and 24th Cycles
| Autor: | M. G. Deminov, V. N. Obridko, E. V. Nepomnyashchaya |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Wolf number 010504 meteorology & atmospheric sciences Flux Solar radio Atmospheric sciences 01 natural sciences Wavelength Geophysics Earth's magnetic field Amplitude Space and Planetary Science Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Ionosphere 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Geomagnetism and Aeronomy. 60:1-6 |
| ISSN: | 1555-645X 0016-7932 |
| Popis: | Characteristics of changes in the solar activity indices (the flux of the solar radio emission at a wavelength of 10.7 cm F and the new version of the relative sunspot number Ri) and the ionospheric index of this activity T in the 23rd and 24th solar cycles, which were low by the amplitude of solar and geomagnetic activity, are analyzed. The running mean over 12 months and smoothed (by a 24-month filter) values of these indices are considered in the analysis. It is found that the relation between the T and F indices was on average stable for these cycles and did not differ from the previous solar cycles. The relation between the T and Ri indices changed with time in the 23rd and 24th cycles and was different from the previous cycles. Moreover, a distinct hysteresis effect in the dependence of the smoothed values of T on Ri was observed in the 24th cycle when different values of T corresponded to a fixed value of Ri in the growing and declining phases of the solar cycle. This effect was absent in the dependence of T on F. Thus, it is confirmed that the F index is a more exact indicator of solar activity for the ionosphere than Ri. |
| Databáze: | OpenAIRE |
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