On the global distribution of sporadic sodium layers
On the global distribution of sporadic sodium layers
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DOI：
10.1029/2007gl030542
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
Z. Fan;J. Plane;J. Gumbel
中科院分区：
文献类型：
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作者：
Z. Fan;J. Plane;J. Gumbel
利用奥丁卫星上的OSIRIS光谱仪对589纳米处的气辉辐射进行临边扫描测量，以获取具有足够垂直分辨率（约2千米）的钠层剖面，从而观测散在钠层（SSLs）。对一个两年的数据库（2003 - 2004年）进行了分析，以确定散在钠层出现频率的全球分布（当地时间0600和1800时）。结果表明，散在钠层在南半球更为普遍，有一个特别活跃的区域从南纬40°以上的南美洲延伸到南极半岛。全球平均散在钠层出现频率约为5%。通过分析连续临边扫描中散在钠层的出现情况，似乎大多数散在钠层的水平范围小于约300千米。然而，在这项为期两年的研究中，有一次观测到两个明显非常大的散在钠层，其纬度延伸约70°。
Limb‐scanning measurements of the dayglow radiance at 589 nm, made with the OSIRIS spectrometer on the Odin satellite, are used to retrieve Na layer profiles with sufficient vertical resolution (∼2 km) to observe sporadic Na layers (SSLs). A two‐year data base (2003–2004) has been analyzed to determine the global distribution of the SSL occurrence frequency (at 0600 and 1800 hrs local time). This shows that SSLs are much more prevalent in the southern hemisphere, with a particularly active region extending from South America at latitudes greater than 40°S to the Antarctic peninsula. The global average SSL occurrence frequency is about 5%. By analyzing the occurrence of SSLs in successive limb scans, it appears that most SSLs have a horizontal extent of less than ∼300 km. However, on one occasion during this 2‐year study, two apparently very large SSLs, extending about 70° in latitude, were observed.