A case study of a sporadic sodium layer observed by the ALOMAR Weber Na lidar
A case study of a sporadic sodium layer observed by the ALOMAR Weber Na lidar
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DOI：
10.5194/angeo-26-1071-2008
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发表时间：
2008-05
影响因子：
1.9
通讯作者：
H. Nesse;D. Heinrich;B. Williams;U. Hoppe;J. Stadsnes;M. Rietveld;W. Singer;U. Blum;M. Sandanger;E. Trondsen
中科院分区：
文献类型：
--
作者：
H. Nesse;D. Heinrich;B. Williams;U. Hoppe;J. Stadsnes;M. Rietveld;W. Singer;U. Blum;M. Sandanger;E. Trondsen
Several possible mechanisms for the production of sporadic sodium layers have been discussed in the literature, but none of them seem to explain all the accumulated obser- vations. The hypotheses range from direct meteoric input, to energetic electron bombardment on meteoric smoke par- ticles, to ion neutralization, to temperature dependent chem- istry. The varied instrumentation located on Andoya and near Tromso in Norway gives us an opportunity to test the differ- ent theories applied to high latitude sporadic sodium layers. We use the ALOMAR Weber sodium lidar to monitor the ap- pearance and characteristics of a sporadic sodium layer that was observed on 5 November 2005. We also monitor the temperature to test the hypotheses regarding a temperature dependent mechanism. The EISCAT Tromso Dynasonde, the ALOMAR/UiO All-sky camera and the SKiYMET me- teor radar on Andoya are used to test the suggested relation- ships of sporadic sodium layers and sporadic E-layers, elec- tron precipitation, and meteor deposition during this event. We find that more than one candidate is eligible to explain our observation of the sporadic sodium layer.
