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DOI | 10.1029/2018GL078524 |
Observations and Modeling of the Mars Low-Altitude Ionospheric Response to the 10 September 2017 X-Class Solar Flare | |
Xu, Shaosui1; Thiemann, Ed2; Mitchell, David1; Eparvier, Frank2; Pawlowski, David3; Benna, Mehdi4; Andersson, Laila2; Liemohn, Michael W.5; Bougher, Stephen5; Mazelle, Christian6 | |
2018-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:15页码:7382-7390 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | Solar extreme ultraviolet and X-ray photons are the main sources of ionization in the Martian ionosphere and can be enhanced significantly during a solar flare. On 10 September 2017, the Mars Atmosphere and Volatile EvolutioN orbiter observed an X8.2 solar flare, the largest it has encountered to date. Here we investigate the ionospheric response before, during, and after this event with the SuperThermal Electron Transport model. We find good agreement between modeled and measured photoelectron spectra. In addition, the high photoelectron fluxes during the flare provide adequate statistics to allow us to clearly and repeatedly identify the carbon Auger peak in the ionospheric photoelectron energy spectra at Mars for the first time. By applying photochemical equilibrium, O-2(+) and CO2+ densities are obtained and compared with Mars Atmosphere and Volatile EvolutioN observations. The variations in ion densities during this event due to the solar irradiance enhancement and the neutral atmosphere expansion are discussed. Plain Language Summary Solar extreme ultraviolet and X-ray photons are the main source of ionization in the Martian ionosphere, photoionizing the neutral particles and producing photoelectrons and ions. These short-wavelength photon fluxes can be enhanced by a factor of a few to orders of magnitudes during a solar flare (the result of the rapid conversion of magnetic energy to kinetic energy in the solar corona). On 10 September 2017, the Mars Atmosphere and Volatile EvolutioN mission encountered the largest solar flare (X8.2) to date. The comprehensive measurements from Mars Atmosphere and Volatile EvolutioN provide us with an opportunity to evaluate the ionospheric response to this flare event in detail with models. In particular, we investigate the photoelectron flux and ion density response to the flare with an electron transport model. The modeled and measured photoelectron fluxes are in a good agreement. Ion density enhancement at a fixed altitude is from tens of percent to 1500% due to a combination of intensified solar photon fluxes and the heated and then expanded neutral atmosphere during this flare event. |
英文关键词 | ionospheric response solar flare Mars photoelectrons ion densities carbon Auger electrons |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443129500017 |
WOS关键词 | PHOTOELECTRON ENERGY PEAKS ; MONOCHROMATIC RADIATION ; ROTATING EARTH ; ZENITH ANGLE ; ATMOSPHERE ; MAVEN ; VENUS ; ABSORPTION ; ELECTRONS ; AERONOMY |
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/25470 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 2.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA; 3.Eastern Michigan Univ, Phys Dept, Ypsilanti, MI 48197 USA; 4.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA; 5.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA; 6.Univ Toulouse, IRAP, CNRS, UPS,CNES, Toulouse, France |
推荐引用方式 GB/T 7714 | Xu, Shaosui,Thiemann, Ed,Mitchell, David,et al. Observations and Modeling of the Mars Low-Altitude Ionospheric Response to the 10 September 2017 X-Class Solar Flare[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(15):7382-7390. |
APA | Xu, Shaosui.,Thiemann, Ed.,Mitchell, David.,Eparvier, Frank.,Pawlowski, David.,...&Mazelle, Christian.(2018).Observations and Modeling of the Mars Low-Altitude Ionospheric Response to the 10 September 2017 X-Class Solar Flare.GEOPHYSICAL RESEARCH LETTERS,45(15),7382-7390. |
MLA | Xu, Shaosui,et al."Observations and Modeling of the Mars Low-Altitude Ionospheric Response to the 10 September 2017 X-Class Solar Flare".GEOPHYSICAL RESEARCH LETTERS 45.15(2018):7382-7390. |
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