Equatorial evening prereversal vertical drift dependence on solar EUV flux and F10.7 index during quiet and disturbed periods over Brazil
Equatorial evening prereversal vertical drift dependence on solar EUV flux and F10.7 index during quiet and disturbed periods over Brazil
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DOI：
10.1002/jgra.50438
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
A. M. Santos;M. A. Abdu;J. Sobral;M. Mascarenhas;P. Nogueira
中科院分区：
文献类型：
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作者：
A. M. Santos;M. A. Abdu;J. Sobral;M. Mascarenhas;P. Nogueira
本文根据在巴西圣路易斯（44.2° W，2.33° S，倾角：−2.7°）和福塔莱萨（38.45° W，3.9° S，倾角：−11.5°）运行的数字探空仪获得的垂直漂移数据，研究了赤道傍晚F区垂直漂移速度对太阳EUV通量和F10.7指数的依赖性。以往的研究，对太阳通量的垂直漂移的依赖性只解决了对F10.7指数的依赖。这里分析的数据来自2001年至2009年的10月，11月和12月，分析是针对磁静和磁扰条件进行的。结果表明，虽然漂移速度峰值是强烈依赖于两个太阳辐射通量，这种依赖程度是更高的EUV通量比F10. 7指数在一个一致的方式判断其相同的行为在圣路易斯和福塔莱萨。该研究还揭示了不同程度的垂直漂移依赖于太阳通量的磁安静和干扰条件下，其性质进行了研究，使用一个例子的风暴时间的案例研究。
A study of the dependence of the equatorial evening F region vertical drift velocity on solar EUV flux and F10.7 index is presented here, based on the vertical drift data obtained from Digisondes operated in São Luis (44.2° W, 2.33° S, dip angle: −2.7°) and Fortaleza (38.45° W, 3.9° S, dip angle: −11.5°) in Brazil. Previous studies on the vertical drift dependence on solar flux have addressed only the dependence on F10.7 index. The data analyzed here are from the months of October, November, and December of the years from 2001 to 2009, and the analysis was done for magnetically quiet and disturbed conditions. The results show that while the drift velocity peak is strongly dependent on both solar emission fluxes, the degrees of such dependence are higher for the EUV flux than for the F10.7 index in a consistent way as judged from its identical behavior at both São Luis and Fortaleza. The study also reveals different degrees of the vertical drift dependence on solar flux for magnetically quiet and disturbed conditions, the nature of which is investigated using an example of a storm time case study.