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标题：The seasonal and solar cycle variations of electron density gradient scale length during magnetically disturbed days: implications for Spread F
其他标题：The seasonal and solar cycle variations of electron density gradient scale length during magnetically disturbed days: implications for Spread F
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作者：G. Manju ; C. V. Devasia ; Sudha Ravindran 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2009
卷号：61
期号：7
页码：913-917
DOI：10.1186/BF03353202
出版社：Springer Verlag
摘要：The behaviour of electron density gradient scale length, L , around post-sunset hours during the magnetically disturbed days of the summer, winter and equinox seasons of solar maximum (2002) and minimum years (1995) has been studied, using ionosonde data of Trivandrum (8.5°N, 76.5°E, dip = 0.5°N) in the Indian longitude sector. The results indicate a clear seasonal and solar cycle variation in L . Seasonal variations of the maximum vertical drift of the F layer were also examined on these days. In particular, the seasonal variation of the Equatorial Spread F (ESF) during this period is examined in terms of the relative roles of L and the vertical drift of the F layer in the triggering of the collisional Rayleigh-Taylor instability. Our results on the clear-cut seasonal and solar cycle variation in L for disturbed days and its control of ESF occurrence are presented and discussed.
关键词：Equatorial ionosphere ;ionospheric irregularities ;plasma instability ;Equatorial Spread F