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Title: Ionosonde observations of daytime spread F at low latitudes
Authors: Chunhua Jiang
Guobin Yang
Jing Liu
Tatsuhiro Yokoyama
Tharadol Komolmis
Huan Song
Ting Lan
Chen Zhou
Yuannong Zhang
Zhengyu Zhao
Keywords: Agricultural and Biological Sciences
Earth and Planetary Sciences
Environmental Science
Issue Date: 1-Dec-2016
Abstract: ©2016. American Geophysical Union. All Rights Reserved. Spread F on ionograms has been considered to be a phenomenon mainly occurred at nighttime. This study presented a case study of daytime spread F observed by the ionosonde installed at Puer (PUR; 22.7°N, 101.05°E; dip latitude 12.9°N), where daytime spread F that lasted for more than 2 h (about 08:30 LT~10:45 LT) was observed on 14 November 2015. To investigate the possible mechanism, ionograms recorded at PUR and Chiang Mai (18.76°N, 98.93°E; dip latitude 9.04°N) were used in this study. We found that traveling ionospheric disturbances were observed before the occurrence of daytime spread F. Meanwhile, the movement of the peak height of the ionosphere was downward. We suggested that downward vertical neutral winds excited by traveling atmospheric disturbances/atmospheric gravity waves might play a significant role in forming daytime spread F over PUR during geomagnetic storms.
ISSN: 21699402
Appears in Collections:CMUL: Journal Articles

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