Exploring the Long-Term Relationship Between Thermospheric ∑O/N<sub>2</sub> and Solar EUV Flux
Column O/N<sub>2</sub> ratio (∑O/N<sub>2</sub>), a physical quantity representing thermospheric disturbances, is influenced by solar extreme ultraviolet radiation flux (Q<sub>EUV</sub>) changes. Investigating the correlation between these two factors is essential...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-4292/17/4/574 |
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| Summary: | Column O/N<sub>2</sub> ratio (∑O/N<sub>2</sub>), a physical quantity representing thermospheric disturbances, is influenced by solar extreme ultraviolet radiation flux (Q<sub>EUV</sub>) changes. Investigating the correlation between these two factors is essential for understanding the evolution of the thermosphere. This study examines the correlation and periodic variations of ∑O/N<sub>2</sub> and Q<sub>EUV</sub> across different phases of solar activity, using data from the Global Ultraviolet Imager (GUVI) spanning from 2002 to 2022. A correlation analysis reveals a positive relationship between ∑O/N<sub>2</sub> and Q<sub>EUV</sub>. The function fitting results show that the magnitude of changes in ∑O/N<sub>2</sub> due to Q<sub>EUV</sub> variations is approximately 30% of the mean ∑O/N<sub>2</sub>. A wavelet analysis reveals their coherence in periodic components of 27-day, annual, and 11-year periods. These results are significant for studying the Sun–Earth coupling mechanism and understanding the impact of space weather on the thermosphere. |
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| ISSN: | 2072-4292 |