Trends in Ionospheric Solar Activity Indices

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Geomagnetism and Aeronomy Pub Date : 2024-10-27 DOI:10.1134/S0016793224600589
M. G. Deminov
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Abstract

The article presents the first results of identifying trends in annual average ionospheric indices ΔIG12 and ΔT12, which are obtained after excluding from IG12 and T12 the dependence of these indices on solar activity indices. In this case, solar activity indices are F10 and F30—solar radio emission fluxes at 10.7 and 30 cm. It was found that for the interval of 1957–2023, all analyzed linear trends are negative, i.e., quantities ΔIG12 and ΔT12 decrease over time, and these trends are significant. In absolute value, they are maximum for ΔIG12, taking into account the IG12 dependence on F1012, and minimum for ΔT12, taking into account the T12 dependence on F3012. Account for the nonlinearity of trends shows that, e.g., after 2010, they intensified. Relations are presented that make it possible, based on data from trends of the ionospheric indices (ΔIG12 or ΔT12), to judge the nature of the Δ foF2 trend over a specific point. For this, using the IRI model for foF2, a coefficient was obtained that gives the relationship between the trends of the ionospheric index and Δ foF2 over this point. Comparison with experimental data at mid-latitudes revealed that trends of the ionospheric indices make it possible to correctly determine the sign of the Δ foF2 trend and the general tendency for this trend change, but the calculated value of the trend over a specific point may differ markedly from the experimental data.

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电离层太阳活动指数趋势
文章介绍了确定电离层年平均指数ΔIG12 和ΔT12 趋势的首批结果,这些指数是从 IG12 和 T12 中排除了对太阳活动指数的依赖之后得到的。在这种情况下,太阳活动指数是指 10.7 和 30 厘米处的太阳射电发射通量 F10 和 F30。研究发现,在 1957-2023 年期间,所有分析的线性趋势都是负的,即 ΔIG12 和 ΔT12 的数量随着时间的推移而减少,而且这些趋势是显著的。考虑到 IG12 与 F1012 的关系,ΔIG12 的绝对值最大,而考虑到 T12 与 F3012 的关系,ΔT12 的绝对值最小。对趋势的非线性分析表明,例如在 2010 年之后,趋势加剧了。根据电离层指数(ΔIG12 或 ΔT12)趋势数据提出的关系,可以判断特定点上 Δ foF2 趋势的性质。为此,利用 foF2 的 IRI 模型获得了一个系数,该系数给出了该点的电离层指数趋势与 Δ foF2 之间的关系。与中纬度地区的实验数据进行比较后发现,电离层指数的趋势可以正确确定 Δ foF2 趋势的符号和这一趋势变化的总趋势,但特定点上趋势的计算值可能与实验数 据有明显差异。
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来源期刊
Geomagnetism and Aeronomy
Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science
CiteScore
1.30
自引率
33.30%
发文量
65
审稿时长
4-8 weeks
期刊介绍: Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.
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