Typical disturbances of the daytime equatorial F region observed with a high-resolution HF radar
Typical disturbances of the daytime equatorial F region observed with a high-resolution HF radar
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高分辨率高频雷达观测到的白天赤道F区的典型扰动
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
E. Houngninou
中科院分区：
文献类型：
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作者：
E. Blanc;E. Houngninou
国际赤道电喷流年（1993-1994年）期间，在非洲磁赤道附近（科霍戈9°24'63″N-5°37'38″W）进行了高频雷达测量。高频雷达是一种高分辨率天顶雷达。它能同时给出几个频率的电离图、多普勒谱和回波参数。本文介绍了一个比较研究的白天电离层结构观测在3天内选择不同的磁条件下，给出了磁强计测量的代表。宽的多普勒频谱，大的回波宽度和振幅波动揭示了小规模的不稳定过程的F-区域的峰值。在不同高度测得的高度变化显示出重力波和与太阳白昼影响和赤道电场有关的大尺度扰动。本文讨论了在存在其它可能的赤道电离层扰动的情况下，从这些多普勒或高度变化测量中反演电离层电场的可能性。
HF radar measurements were performed near the magnetic equator in Africa (Korhogo 9°24’63″N–5°37’38″W) during the International Equatorial Electrojet Year (1993–1994). The HF radar is a high–resolution zenithal radar. It gives ionograms, Doppler spectra and echo parameters at several frequencies simultaneously. This paper presents a comparative study of the daytime ionospheric structures observed during 3 days selected as representative of different magnetic conditions, given by magnetometer measurements. Broad Doppler spectra, large echo width, and amplitude fluctuations revealed small-scale instability processes up to the F-region peak. The height variations measured at different altitudes showed gravity waves and larger-scale disturbances related to solar daytime influence and equatorial electric fields. The possibility of retrieving the ionospheric electric fields from these Doppler or height variation measurements in the presence of the other possible equatorial ionospheric disturbances is discussed.