Wide-field auroral imager onboard the Fengyun satellite
| Autor: | Xiaodong Wang, Quan-Feng Guo, Peng Zhang, Chao Yu, Zhong-Dong Yang, Zhong-Su Wang, Fei He, Jia-Wei Li, Zhang Peijie, Xin Zhang, Wang Jinsong, Liang Sun, Hai-Feng Wang, Shijie Liu, GuangXing Ding, Bo Chen, Liheng Chen, Zhang Hongji, Guang-Wei Shi, Zhen-Wei Han, Xiaoxin Zhang, He Lingping, Song Kefei, Dai Shuang |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Applied optics. Photonics
Field of view 02 engineering and technology 01 natural sciences Article Physics::Geophysics 010309 optics 0103 physical sciences lcsh:QC350-467 Image resolution Physics::Atmospheric and Oceanic Physics Remote sensing lcsh:TA1501-1820 Imaging and sensing 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Atmospheric optics Solar wind Atmosphere of Earth Earth's magnetic field Physics::Space Physics Satellite Astrophysics::Earth and Planetary Astrophysics Ionosphere 0210 nano-technology Geology lcsh:Optics. Light |
| Zdroj: | Light, Science & Applications Light: Science & Applications, Vol 8, Iss 1, Pp 1-12 (2019) |
| ISSN: | 2047-7538 2095-5545 |
| Popis: | The newly launched Fengyun-3D (FY-3D) satellite carried a wide-field auroral imager (WAI) that was developed by Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CIOMP), which will provide a large field of view (FOV), high spatial resolution, and broadband ultraviolet images of the aurora and the ionosphere by imaging the N2 LBH bands of emissions. The WAI consists of two identical cameras, each with an FOV of 68° in the along-track direction and 10° in the cross-track direction. The two cameras are tilted relative to each other to cover a fan-shaped field of size 130° × 10°. Each camera consists of an unobstructed four-mirror anastigmatic optical system, a BaF2 filter, and a photon-counting imaging detector. The spatial resolution of WAI is ~10 km at the nadir point at a reference height of 110 km above the Earth’s surface. The sensitivity is >0.01 counts s−1 Rayleigh−1 pixel−1 (140–180 nm) for both cameras, which is sufficient for mapping the boundaries and the fine structures of the auroral oval during storms/substorms. Based on the tests and calibrations that were conducted prior to launch, the data processing algorithm includes photon signal decoding, geometric distortion correction, photometric correction, flat-field correction, line-of-sight projection and correction, and normalization between the two cameras. Preliminarily processed images are compared with DMSP SSUSI images. The agreement between the images that were captured by two instruments demonstrates that the WAI and the data processing algorithm operate normally and can provide high-quality scientific data for future studies on auroral dynamics. Satellite imaging: Mapping Earth’s auroras for space weather A compact camera system on board China’s recently launched Fengyun-3D satellite can reveal subtle features of the Earth’s auroras for improved space weather forecasting. Auroras such as the northern lights arise when solar wind charged particles precipitate along the Earth’s magnetic field and collide with atmospheric gases. Xiao-Xin Zhang, Bo Chen and their colleagues have developed a high-resolution imager that can help researchers predict geomagnetic substorms and storms from the dynamic configurations of auroras. The imager uses two cameras to simultaneously scan auroral regions from a low Earth orbit, delivering an expanded field of view relative to previous instruments. In-orbit testing shows that the device’s mirror-based optics and data processing system can identify boundaries and structures of auroras with 10 kilometer-scale resolution. |
| Databáze: | OpenAIRE |
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