doi:10.11728/cjss2022.05.210414051

Simulation of ENA Imaging Measurements on a Geosynchronous Orbit

doi: 10.11728/cjss2022.05.210414051

LU Li^{1, 2, 3
,},
YU Qinglong^{1, 2, 3},
ZHOU Ping^{1, 2, 3},
JIA Shuai^{1, 2, 3},
CHANG Yuan^{1, 2, 3, 4}

1.
Laboratory of Space Environment Exploration, National Space Science Center, Chinese Academy of Sciences, Beijing 100190
2.
Beijing Key Laboratory of Space Environment Exploration, Beijing 100190
3.
Key Laboratory of Science and Technology on Space Environment Situational Awareness, Chinese Academy of Science, Beijing 100049
4.
Shanghai Institute of Satellite Engineering, Shanghai 200240

Funds: Supported by National Key R&D Program of China (2020YFE0202100), National Mission/Other National Mission: Research on Key Technologies of the Outer Heliospheric Space Exploration System (Y91 Z100102) and National Mission/National Major Science and Technology Project: CE-7 Relay Satellite Display Neutral Atom Imager (E16504 B31 S)

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Author Bio:
E-mail: luli@nssc.ac.cn

摘要

Abstract: Geosynchronous orbit is located in the ring current region, where the energetic particle emission environment challenges the ion deflection design limit of the Energetic Neutral Atom (ENA) imager. Therefore, there is no measurement record of ENA imaging in this area before. On the basis of possessing the patent of high-energy ion deflection technology, ENA imaging under different Kp index in geosynchronous orbit is simulated. The simulation images show the characteristics of low-altitude ENA emission source and the rough sketch of magnetosphere. Due to the north-south conjugation observation of geosynchronous orbit, the simulated ENA images at different positions all have north-south symmetry. Aiming at the unsolved problems, such as the input source of ring current energetic ions during geomagnetic activities and its evolution process, we analyzed the possible results of ENA imaging combined with in-situ particle measurements in the same satellite, as well as the subversion effect of any north-south asymmetry of ENA map on the inversion model.
- Energetic Neutral Atom (ENA) /
- Magnetosphere /
- Ring current /
- ENA imaging

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Figure 1. Geosynchronous orbit and ENA imaging simulation positions

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Figure 2. Equatorial ion flux distribution with geomagnetic active index Kp of 3, 5 and 7, respectively

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Figure 3. Simulation ENA image with the integral time of 1 min for 4 feature positions under different geomagnetic activity conditions. The spatial angular resolution of each pixel is 6°×6°

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Table 1. Maximum hydrogen ion fluxes

Kp index 3 5 7

Maximum ion flux/
(cm^–2·sr^–1·keV^–1·s^–1) 5.07×10⁵ 1.31×10⁶ 2.3×10⁶
Location of L/
R_e 6.4 4.6 3.2

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Table 2. Maximum ENA counts

Kp index 3 5 7

Noon 1603.9397 3081.94775 5071.10938
Dusk 2944.28613 5501.90088 9027.37207
Night 1672.59656 3639.30688 6446.42285
Dawn 2944.28687 5501.91699 9027.36035

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