Vertical and longitudinal electron density structures of equatorial E- and F-regions

被引：16

作者：

Brahmanandam, P. S. ^{[1
,2
]}

Chu, Y. -H. ^{[2
]}

Wu, K. -H. ^{[2
]}

Hsia, H. -P. ^{[2
]}

Su, C. -L. ^{[2
]}

Uma, G. ^{[1
,2
]}

机构：

[1] KL Univ, Dept Elect & Commun Engn, Vaddeswaram 522502, India

[2] Natl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan

来源：

ANNALES GEOPHYSICAE | 2011年 / 29卷 / 01期

关键词：

Ionosphere; Electric fields and currents; Equatorial ionosphere; IONOSPHERE; TIDES;

D O I：

10.5194/angeo-29-81-2011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From global soundings of ionospheric electron density made with FORMOSAT 3/COSMIC satellites for September 2006-August 2009, day-night variations in vertical and longitudinal structures of the electron densities in equatorial E-and F-regions for different seasons are investigated for the first time. The results reveal that the wavenumber-3 and wavenumber-4 patterns dominated the nighttime (22:00-04:00 LT) F-region longitudinal structures in solstice and in equinox seasons, respectively. In daytime (08:00-18:00 LT) F-region, the wavenumber-4 patterns governed the longitudinal structures in the September equinox and December solstice, and wavenumber-3 in March equinox and June solstice respectively. A comparison of the daytime and nighttime longitudinal electron density structures indicates that they are approximately 180 degrees out of phase with each other. It is believed that this out of phase relation is very likely the result of the opposite phase relation between daytime and nighttime nonmigrating diurnal tidal winds that modulate background E-region dynamo electric field at different places, leading to the day-night change in the locations of the equatorial plasma fountains that are responsible for the formation of the F-region longitudinal structures. Further, a good consistency between the locations of the density structures in the same seasons of the different years for both day-time and nighttime epochs has been noticed indicating that the source mechanism for these structures could be the same.

引用

页码：81 / 89

页数：9

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