1.27μm波段的氧分子近红外气辉是火星大气最重要的气辉辐射之一,该气辉高光谱分辨辐射传输模型的建立对于研制火星探测载荷,反演火星大气的风场温度场与臭氧浓度,以及研究火星空间物理,有重要的科学价值与工程意义.在研究火星大气O_(2)...1.27μm波段的氧分子近红外气辉是火星大气最重要的气辉辐射之一,该气辉高光谱分辨辐射传输模型的建立对于研制火星探测载荷,反演火星大气的风场温度场与臭氧浓度,以及研究火星空间物理,有重要的科学价值与工程意义.在研究火星大气O_(2)(a^(1)Δ_(g))气辉光化学反应模型的基础上,提出了O_(2)(a^(1)Δ_(g))气辉体辐射率的计算方法,并建立了火星大气气辉辐射传输理论;通过与用于研究火星大气特征的光谱学探测仪(Spectroscopy Spectrograph for the Investigation of Characteristics of the Atmosphere of Mars,SPICAM)的实测数据进行对比,验证了所建立的火星O_(2)(a^(1)Δ_(g))气辉高光谱分辨辐射传输模型的准确性;针对火星与地球大气的O_(2)(a^(1)Δ_(g))气辉,在体辐射率、自吸收效应,以及临边辐射光谱特性三个方面进行了系统深入的比较,对比结果表明,火星大气由于密度低、氧气丰度小,其自吸收效应可以忽略不计,但其O_(2)(a^(1)Δ_(g))气辉辐射强度与地球大气相当,可以用于火星大气的风场温度场与臭氧浓度的探测与反演.展开更多
The Atmospheric Ultraviolet Radiance Integrated Code(AURIC) is a software package developed by Computational Physics, Inc.(CPI) under the sponsorship of the Air Force Phillips Laboratory/Geophysics Directorate(PL/GP)(...The Atmospheric Ultraviolet Radiance Integrated Code(AURIC) is a software package developed by Computational Physics, Inc.(CPI) under the sponsorship of the Air Force Phillips Laboratory/Geophysics Directorate(PL/GP)(currently the Air Force Research Laboratory) for middle and upper atmospheric radiance modeling from the far ultraviolet to the near infrared. The AURIC has been considered as a general model for the radiative transfer simulation of airglow. Based on the theory of MODerate resolution atmospheric TRANsmission(MODTRAN), the AURIC extends calculation to altitudes above 100 km and the wavelength down to 80 nm. A package of AURIC v1.2 was released in 2002, which can be used for single-point simulation from 1947 to 1999. It means that the model is not suitable for atmospheric simulation of large datasets or for atmospheric parameters retrieval from amount of satellite measurements. In this paper, AURIC v1.2 is upgraded to AURIC-2012 based on MATLAB with improvements for modules of the Geomagnetic Parameter(GEOPARM), Atmosphere neutral composition(ATOMS), and Ionospheric electron density(IONOS). The improved AURIC can be used for global automatic airglow simulation and also for automatic retrieval of atmospheric compositions from satellite global observations, such as O/N2 and electron density etc. Besides, the model supplies possibilities for further improvement of airglow radiative mechanism and for substitution of other modules. Based on the AURIC-2012, Limb Column Emission Intensity(L-CEI) and Volume Emission Rate(VER) are calculated. For validation, the results were compared with measurements of the Global Ultraviolet Imager(GUVI) and TIMED Doppler Interferometer(TIDI), respectively. The averaged relative errors of L-CEI and VER at peak altitude are both within 20%. Finally, L-CEI varying with latitude, altitude, solar activity, and geomagnetic activity is simulated, and the distribution characteristics of the simulation and their influencing factors are analyzed subsequently.展开更多
Fabry-Perot Interferometer(FPI) has been used widely for wind measurements of the middle and upper atmosphere.To date, most of FPIs have been based on full-closed circular fringe, which needs 15–25 min to obtain a gr...Fabry-Perot Interferometer(FPI) has been used widely for wind measurements of the middle and upper atmosphere.To date, most of FPIs have been based on full-closed circular fringe, which needs 15–25 min to obtain a group of wind velocity(zonal and meridional). However, it is hard to improve the temporal resolution because full-closed circular fringe in several directions cannot be easily imaged onto the same Charge-Coupled Device(CCD) with enough airglow intensity. In this paper, a data processing method is proposed for non-full circular fringe of FPI, which can support CCD with enough area of observations in several directions simultaneously. The method is focused on the center determination of non-full fringe. It includes radial cross-section, peak coordinate determination, and center calculation. Based on the calculated center, the fringe is annular summed. Then its radius is determined subsequently using Gaussian fitting. Finally, the wind is retrieved from the fringe radius. For validation, fringes from two ground-based FPIs were used, which are deployed in Kelan(38.71°N, 111.58°E) and Xinglong(40.40°N, 117.59°E) in China. The results retrieved from non-full fringes of FPIs were compared with that from full-closed circular fringe. The averaged wind deviation between them demonstrates reasonable difference with 5.38 ms^-(1) for 892.0 nm airglow emission, 5.81 ms^-(1) for 630.0 nm emission, and 3.03 ms^-(1) for 557.7 nm emission. Besides, wind results of Xinglong FPI are compared roughly with measurements of meteor radar which is deployed in Ming Tombs of Beijing(40.3°N,116.2°E). Good agreement demonstrates that this method is robust enough for FPI wind retrieval of mesosphere and thermosphere.展开更多
文摘1.27μm波段的氧分子近红外气辉是火星大气最重要的气辉辐射之一,该气辉高光谱分辨辐射传输模型的建立对于研制火星探测载荷,反演火星大气的风场温度场与臭氧浓度,以及研究火星空间物理,有重要的科学价值与工程意义.在研究火星大气O_(2)(a^(1)Δ_(g))气辉光化学反应模型的基础上,提出了O_(2)(a^(1)Δ_(g))气辉体辐射率的计算方法,并建立了火星大气气辉辐射传输理论;通过与用于研究火星大气特征的光谱学探测仪(Spectroscopy Spectrograph for the Investigation of Characteristics of the Atmosphere of Mars,SPICAM)的实测数据进行对比,验证了所建立的火星O_(2)(a^(1)Δ_(g))气辉高光谱分辨辐射传输模型的准确性;针对火星与地球大气的O_(2)(a^(1)Δ_(g))气辉,在体辐射率、自吸收效应,以及临边辐射光谱特性三个方面进行了系统深入的比较,对比结果表明,火星大气由于密度低、氧气丰度小,其自吸收效应可以忽略不计,但其O_(2)(a^(1)Δ_(g))气辉辐射强度与地球大气相当,可以用于火星大气的风场温度场与臭氧浓度的探测与反演.
基金funded by the Strategic Pilot Projects in Space Science of Chinese Academy of Sciences(Grant No.XDA04060202)
文摘The Atmospheric Ultraviolet Radiance Integrated Code(AURIC) is a software package developed by Computational Physics, Inc.(CPI) under the sponsorship of the Air Force Phillips Laboratory/Geophysics Directorate(PL/GP)(currently the Air Force Research Laboratory) for middle and upper atmospheric radiance modeling from the far ultraviolet to the near infrared. The AURIC has been considered as a general model for the radiative transfer simulation of airglow. Based on the theory of MODerate resolution atmospheric TRANsmission(MODTRAN), the AURIC extends calculation to altitudes above 100 km and the wavelength down to 80 nm. A package of AURIC v1.2 was released in 2002, which can be used for single-point simulation from 1947 to 1999. It means that the model is not suitable for atmospheric simulation of large datasets or for atmospheric parameters retrieval from amount of satellite measurements. In this paper, AURIC v1.2 is upgraded to AURIC-2012 based on MATLAB with improvements for modules of the Geomagnetic Parameter(GEOPARM), Atmosphere neutral composition(ATOMS), and Ionospheric electron density(IONOS). The improved AURIC can be used for global automatic airglow simulation and also for automatic retrieval of atmospheric compositions from satellite global observations, such as O/N2 and electron density etc. Besides, the model supplies possibilities for further improvement of airglow radiative mechanism and for substitution of other modules. Based on the AURIC-2012, Limb Column Emission Intensity(L-CEI) and Volume Emission Rate(VER) are calculated. For validation, the results were compared with measurements of the Global Ultraviolet Imager(GUVI) and TIMED Doppler Interferometer(TIDI), respectively. The averaged relative errors of L-CEI and VER at peak altitude are both within 20%. Finally, L-CEI varying with latitude, altitude, solar activity, and geomagnetic activity is simulated, and the distribution characteristics of the simulation and their influencing factors are analyzed subsequently.
基金supported by National Space Science Center (Xinglong FPI data)Institute of Geology and Geophysics (meteor radar data)Beijing Municipal Science and Technology Commission (Grant No. Z151100003615001)
文摘Fabry-Perot Interferometer(FPI) has been used widely for wind measurements of the middle and upper atmosphere.To date, most of FPIs have been based on full-closed circular fringe, which needs 15–25 min to obtain a group of wind velocity(zonal and meridional). However, it is hard to improve the temporal resolution because full-closed circular fringe in several directions cannot be easily imaged onto the same Charge-Coupled Device(CCD) with enough airglow intensity. In this paper, a data processing method is proposed for non-full circular fringe of FPI, which can support CCD with enough area of observations in several directions simultaneously. The method is focused on the center determination of non-full fringe. It includes radial cross-section, peak coordinate determination, and center calculation. Based on the calculated center, the fringe is annular summed. Then its radius is determined subsequently using Gaussian fitting. Finally, the wind is retrieved from the fringe radius. For validation, fringes from two ground-based FPIs were used, which are deployed in Kelan(38.71°N, 111.58°E) and Xinglong(40.40°N, 117.59°E) in China. The results retrieved from non-full fringes of FPIs were compared with that from full-closed circular fringe. The averaged wind deviation between them demonstrates reasonable difference with 5.38 ms^-(1) for 892.0 nm airglow emission, 5.81 ms^-(1) for 630.0 nm emission, and 3.03 ms^-(1) for 557.7 nm emission. Besides, wind results of Xinglong FPI are compared roughly with measurements of meteor radar which is deployed in Ming Tombs of Beijing(40.3°N,116.2°E). Good agreement demonstrates that this method is robust enough for FPI wind retrieval of mesosphere and thermosphere.
