Wagener R, Caldwell J, Owen T, Kim S J, Encrenaz T, Combes M
Department of Earth and Space Science, State University of New York, Stony Brook 11794-2100, USA.
Icarus. 1985;63:222-36. doi: 10.1016/0019-1035(85)90007-7.
The center-of-disk reflectivity of Jupiter in the wavelength range from 1450 to 3150 angstroms has been computed from 30 low-dispersion IUE spectra taken during solar maximum in 1978-1980. A vertically inhomogeneous radiative transfer program is used to compute model reflectivities of various stratospheric compositions for comparison. Ammonia and acetylene are well determined because they show narrow absorption bands in the ultraviolet. Above 1800 angstroms, these two gases provide a good fit to the data, but not below. At shorter wavelengths the fit would be much improved by a small amount (0.5-1.5 ppb) of propadiene/allene (C3H4). Voyager IRIS spectra show that the IR bands of allene are not strong enough to be detected in such a small amount. Additional absorption around 1600 angstroms can be reproduced best with the presence of cyclopropane (C3H6, <15 ppb), although other absorbers (e.g., hydrocarbon molecules with more than three carbon atoms, oxygen- or nitrogen-containing molecules, or a high-altitude haze) could also explain the spectrum in this region. The data are too noisy to detect possible CO Cameron band absorption near 2000 angstroms.
利用1978 - 1980年太阳活动极大期拍摄的30张低色散国际紫外探测卫星（IUE）光谱，计算了木星在1450至3150埃波长范围内的盘中心反射率。采用垂直非均匀辐射传输程序计算各种平流层成分的模型反射率以供比较。氨和乙炔的含量能够很好地确定，因为它们在紫外波段呈现出窄吸收带。在1800埃以上，这两种气体能很好地拟合数据，但在1800埃以下则不然。在较短波长下，若存在少量（0.5 - 1.5 ppb）的丙二烯/丙炔（C3H4），拟合效果会有很大改善。旅行者号红外干涉光谱仪（Voyager IRIS）光谱显示，丙炔的红外波段不够强，无法在如此少量的情况下被检测到。在大约1600埃处的额外吸收，在存在环丙烷（C3H6，<15 ppb）的情况下能得到最佳再现，不过其他吸收体（例如含三个以上碳原子的烃分子、含氧或含氮分子，或高空霾）也能解释该区域的光谱。数据噪声太大，无法检测到在2000埃附近可能存在的一氧化碳卡梅伦带吸收。
