Seasonal dependence of the ionospheric heating effects under varied solar activity

As the annual variation of solar activity, the effect of ionospheric heating varies in a solar cycle. In this paper, we research the ionospheric heating at equinox and solstice with the modified SAMI2 model in the year within 23rd solar cycle. We find that except the F10.7 index, which play a critic...

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Bibliographic Details
Published in:Advances in space research 2023-11, Vol.72 (10), p.4392-4401
Main Authors: Meng, Xing, Weng, Libin
Format: Article
Language:English
Subjects:
Annual variation
Ionospheric heating
SAMI2 model
Seasonal dependence
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Summary:As the annual variation of solar activity, the effect of ionospheric heating varies in a solar cycle. In this paper, we research the ionospheric heating at equinox and solstice with the modified SAMI2 model in the year within 23rd solar cycle. We find that except the F10.7 index, which play a critical role in the process of ionospheric heating, has a significant influence on the value of electron density, the distribution of the electron density also matters for the heating effects. In the year of 2003, a strong seasonal dependence can be found. But in other years of the same solar cycle, the seasonal dependence is not obvious. There may be a threshold for the electron density. When the ionospheric background electron density is less than the threshold, the ionospheric heating effects will be obvious. It can produce cavity structure of electron density and arc structure with enhanced electron density.
ISSN:0273-1177
DOI:10.1016/j.asr.2023.07.065