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DOI | 10.1029/2021GL092980 |
Photoionization Loss of Mercury's Sodium Exosphere: seasonal observations by MESSENGER and the THEMIS telescope | |
Jamie M. Jasinski; Timothy A. Cassidy; Jim M. Raines; Anna Milillo; Leonardo H. Regoli; Ryan Dewey; James A. Slavin; Valeria Mangano; Neil Murphy | |
2021-03-27 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | We present the first investigation and quantification of the photoionization loss process to Mercury's sodium exosphere from spacecraft and ground‐based observations. We analyze plasma and neutral sodium measurements from NASA's MESSENGER spacecraft and the THEMIS telescope. We find that the sodium ion (Na+) content and therefore the significance of photoionization varies with Mercury's orbit around the Sun (i.e. true anomaly angle: TAA). Na+ production is affected by the neutral sodium solar‐radiation acceleration loss process. More Na+ was measured on the inbound leg of Mercury's orbit at 180‐360º TAA because less neutral sodium is lost downtail from radiation acceleration. Calculations using results from observations show that the photoionization loss process removes ∼1024 atoms/s from the sodium exosphere (maxima of 4x1024 atoms/s), showing that modeling efforts underestimate this loss process. This is an important result as it shows that photoionization is a significant loss process and larger than loss from radiation acceleration. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/320952 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Jamie M. Jasinski,Timothy A. Cassidy,Jim M. Raines,et al. Photoionization Loss of Mercury's Sodium Exosphere: seasonal observations by MESSENGER and the THEMIS telescope[J]. Geophysical Research Letters,2021. |
APA | Jamie M. Jasinski.,Timothy A. Cassidy.,Jim M. Raines.,Anna Milillo.,Leonardo H. Regoli.,...&Neil Murphy.(2021).Photoionization Loss of Mercury's Sodium Exosphere: seasonal observations by MESSENGER and the THEMIS telescope.Geophysical Research Letters. |
MLA | Jamie M. Jasinski,et al."Photoionization Loss of Mercury's Sodium Exosphere: seasonal observations by MESSENGER and the THEMIS telescope".Geophysical Research Letters (2021). |
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