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首页> 外文期刊>Geophysical Research Letters >Distribution of the O-2 infrared nightglow observed with VIRTIS on board Venus Express
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Distribution of the O-2 infrared nightglow observed with VIRTIS on board Venus Express

机译：在Venus Express上使用VIRTIS观察到的O-2红外夜光的分布

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摘要

We present characteristics of the statistical horizontal distribution of the O-2 infrared nightglow over most of the southern hemisphere observed with the VIRTIS instrument over a period spanning nearly 11 months of low solar activity. We show that the distribution is inhomogeneous with the regions of brightest emission reaching similar to 3 MegaRayleighs (MR) located at low latitude near and dawnward of the midnight meridian. The hemispherically averaged nadir brightness is 1.3 MR, in very good agreement with earlier ground based observations. We show that the dayside supply of O atoms is sufficient to produce the observed global O-2 nightglow if approximately 50% of the dayside O production is carried to the nightside by the subsolar to antisolar global circulation. Limb profiles observed at northern mid-latitudes exhibit large intensity variations over short time periods. Calculations with a one-dimensional chemical diffusive model produce an airglow peak at 96 km, in agreement with the limb observations. The atomic oxygen density derived from the best fits to O-2 airglow limb profiles reaches a maximum of 1.8 -3.5 x 10(11) cm(-3) at 104 km.
机译：我们介绍了VIRTIS仪器在近11个月的低太阳活动期间观察到的O-2红外夜光在整个南半球大部分区域的统计水平分布特征。我们显示出分布不均匀，最亮的发射区域达到了类似于午夜子午线附近和黎明的低纬度处的3 MegaRayleighs（MR）。半球的最低点平均亮度为1.3 MR，与早期的地面观测非常吻合。我们表明，如果大约50％的白天O产生量是由次太阳到反太阳的整体环流带到夜间，则O原子在白天的供给足以产生观测到的全球O-2夜光。在北中纬度观察到的肢体轮廓在短时间内表现出较大的强度变化。与肢体观察结果一致，使用一维化学扩散模型进行的计算在96 km处产生气辉峰。最适合O-2气辉四肢轮廓的原子氧密度在104 km处最大达到1.8 -3.5 x 10（11）cm（-3）。

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