Ionospheric long-term trends for South American mid-latitudes

被引：39

作者：

Foppiano, AJ ^{[1
]}

Cid, L

Jara, V

机构：

[1] Univ Concepcion, Dept Fis Atmosfera & Oceano, Concepcion, Chile

[2] Univ Concepcion, Dept Estadist, Concepcion, Chile

[3] Univ Concepcion, Unidad Acad Los Angeles, Concepcion, Chile

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 1999年 / 61卷 / 09期

关键词：

D O I：

10.1016/S1364-6826(99)00025-5

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Using ionosonde made observations at Concepcion (36.8 degrees S; 73.0 degrees W) for the 1958-1994 interval, long-term trends of critical frequency (foF2) and peak height (hmF2) of the ionospheric F2-layer are analysed. The trends found for different times-of-day and all seasons are consistent with an increasing diurnal-variation amplitude of both foF2 and hmF2. An increasing hmF2 trend of up to 1.5 km/year found between midnight and dawn during winter has no precedent. It is suggested that these long-term amplitude changes may be associated with changes in the prevailing thermospheric meridional neutral winds. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：717 / 723

页数：7

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