Photoionization and Photodissociation Rates across a Solar Cycle
Unattenuated photoionization and photodissociation rate coefficients are calculated using solar spectral irradiance measurements across a continuous solar cycle spanning 2004–2014. These rates are organized by corresponding daily F _10.7 P indices, where F _10.7 P $=\,\frac{1}{2}({F}_{10.7}+{F}_{10....
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | The Planetary Science Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/PSJ/add6a2 |
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| Summary: | Unattenuated photoionization and photodissociation rate coefficients are calculated using solar spectral irradiance measurements across a continuous solar cycle spanning 2004–2014. These rates are organized by corresponding daily F _10.7 P indices, where F _10.7 P $=\,\frac{1}{2}({F}_{10.7}+{F}_{10.7}A)$ , F _10.7 is a common historical proxy for solar ultraviolet and soft X-ray activity, and F _10.7 A is its 81 day running average. Power-law relationships are established between F _10.7 P and photo rate coefficients for 48 reactions across 12 of the most common species in solar system upper atmospheres and cometary comae: H, H _2 , OH, H _2 O, O, O _2 , C, CO, CO _2 , N _2 , N, and CH _4 . The resulting coefficients are broadly consistent with previous estimates and provide a practical, efficient means of estimating photoionization and photodissociation rates for a range of planetary and cometary applications. |
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| ISSN: | 2632-3338 |