@Article{LiNAWWYLLY:2017:FiObPr,
author = "Li, Guozhu and Ning, Baiqi and Abdu, Mangalathayil Ali and Wan,
Weixing and Wang, Chi and Yang, Guotao and Liu, Kangkang and Liu,
Libo and Yan, Chunxiao",
affiliation = "{Chinese Academy of Sciences} and {Chinese Academy of Sciences}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Chinese Academy of Sciences} and {Chinese Academy of Sciences}
and {Chinese Academy of Sciences} and {Chinese Academy of
Sciences} and {Chinese Academy of Sciences} and {Chinese Academy
of Sciences}",
title = "First observation of presunset ionospheric F region bottom-type
scattering layer",
journal = "Journal of Geophysical Research: Space Physics",
year = "2017",
volume = "122",
number = "3",
pages = "3788--3797",
month = "Mar.",
abstract = "The bottom-type irregularity scattering layer (BSL) that can
appear in the ionospheric F region bottomside has been observed
generally after sunset, serving as a possible telltale of
equatorial spread F (ESF). Using simultaneous multibeam radar
measurements over two low-latitude stations, Sanya (18.3 degrees
N, 109.6 degrees E; dip latitude 13 degrees N) and Fuke (19.3
degrees N, 109.1 degrees E; dip latitude 14 degrees N) in China,
we report, for the first time, a thin BSL that initially occurred
at presunset (similar to 1720 LT), much earlier than the
occurrence of BSL generated from the equatorial plasma shear
vortex-driven instability. The presunset BSL was situated around
225km altitude and continued to exist until the appearance of ESF
plumes after sunset (similar to 1930 LT). Interestingly, the
Doppler velocities of the presunset BSL echoes measured by the
radar and the F layer virtual heights obtained from the collocated
Digisonde measurements over Sanya both show oscillations with a
period of about 1 h, suggesting a close link between the
occurrences of the BSL and of F region plasma density large-scale
wave structure before sunset. These observations could imply an
important role of gravity waves in the generation of the presunset
F region bottom-type irregularities.",
doi = "10.1002/2016JA023647",
url = "http://dx.doi.org/10.1002/2016JA023647",
issn = "2169-9402",
language = "en",
targetfile = "Li_first.pdf",
urlaccessdate = "27 abr. 2024"
}