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DOI | 10.1029/2019GL083499 |
The Effects of Crustal Magnetic Fields and Solar EUV Flux on Ionopause Formation at Mars | |
Chu, F.1; Girazian, Z.1; Gurnett, D. A.1; Morgan, D. D.1; Halekas, J.1; Kopf, A. J.1; Thiemann, E. M. B.2; Duru, F.3 | |
2019-09-06 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | We study the ionopause of Mars using a database of 6,893 ionopause detections obtained over 11 years by the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) experiment. The ionopause, in this work, is defined as a steep density gradient that appears in MARSIS remote sounding ionograms as a horizontal line at frequencies below 0.4 MHz. We find that the ionopause is located on average at an altitude of 363 +/- 65 km. We also find that the ionopause altitude has a weak dependence on solar zenith angle and varies with the solar extreme ultraviolet (EUV) flux on annual and solar cycle time scales. Furthermore, our results show that very few ionopauses are observed when the crustal field strength at 400 km is greater than 40 nT. The strong crustal fields act as minimagnetospheres that alter the solar wind interaction and prevent the ionopause from forming. |
英文关键词 | ionopause Mars crustal magnetic fields solar EUV flux Mars Express MARSIS |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000485373900001 |
WOS关键词 | MARTIAN IONOSPHERE ; WIND INTERACTION ; DAYSIDE IONOSPHERE ; ELECTRON-DENSITY ; PILEUP BOUNDARY ; RADAR SOUNDINGS ; ION COMPOSITION ; VENUS ; ASYMMETRIES ; PRESSURE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/186953 |
专题 | 气候变化 |
作者单位 | 1.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA; 2.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 3.Coe Coll, Dept Phys, Cedar Rapids, IA 52402 USA |
推荐引用方式 GB/T 7714 | Chu, F.,Girazian, Z.,Gurnett, D. A.,et al. The Effects of Crustal Magnetic Fields and Solar EUV Flux on Ionopause Formation at Mars[J]. GEOPHYSICAL RESEARCH LETTERS,2019. |
APA | Chu, F..,Girazian, Z..,Gurnett, D. A..,Morgan, D. D..,Halekas, J..,...&Duru, F..(2019).The Effects of Crustal Magnetic Fields and Solar EUV Flux on Ionopause Formation at Mars.GEOPHYSICAL RESEARCH LETTERS. |
MLA | Chu, F.,et al."The Effects of Crustal Magnetic Fields and Solar EUV Flux on Ionopause Formation at Mars".GEOPHYSICAL RESEARCH LETTERS (2019). |
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