期刊
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
卷 120, 期 2, 页码 278-286出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JE004726
关键词
Martian ionosphere; Chapman theory; electron temperature
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB09040400]
- National Science Foundation of China (NSFC) [41174146, 41374178, 11103063]
- UK Science and Technology Facilities Council (STFC) Consolidated Grant
- Swedish Research Council [2011-894]
- STFC [ST/K001051/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K001051/1] Funding Source: researchfish
We propose a revised Chapman model for the ionosphere of Mars by allowing for vertical variation of electron temperature. An approximate energy balance between solar EUV heating and CO2 collisional cooling is applied in the dayside Martian ionosphere, analogous to the method recently proposed by Withers et al. (2014). The essence of the model is to separate the contributions of the neutral and electron thermal structures to the apparent width of the main ionospheric layer. Application of the model to the electron density profiles from the Mars Global Surveyor (MGS) radio occultation measurements reveals a clear trend of elevated electron temperature with increasing solar zenith angle (SZA). It also reveals that the characteristic length scale for the change of electron temperature with altitude decreases with increasing SZA. These observations may imply enhanced topside heat influx near the terminator, presumably an outcome of the solar wind interactions with the Martian upper atmosphere. Our analysis also reveals a tentative asymmetry in electron temperature between the northern and southern hemispheres, consistent with the scenario of elevated electron temperature within minimagnetospheres.
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