@Article{LimaAraAlvBatCle:2015:VaMeHe,
author = "Lima, Lourivaldo Mota and Ara{\'u}jo, Luciana Rodrigues and
Alves, E. O. and Batista, Paulo Prado and Clemesha, Barclay
Robert",
affiliation = "{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and
{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and
{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Variations in meteor heights at 22.7°S during solar cycle 23",
journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
year = "2015",
volume = "133",
pages = "139--144",
month = "Oct.",
keywords = "Meteors, Meteor radar, Solar cycle, Long-term trend.",
abstract = "The meteor radar measurements obtained at Cachoeira Paulista
(22.7°S), Brazil, have been used to study a possible relationship
between meteor echo height variations and solar flux during solar
cycle 23. A good concordance between the normalized values of the
annual mean of the meteor peak heights and F10.7 solar radio flux
and Mg_II solar indexes have been observed during declining phase
of the solar cycle 23. After eliminating the solar activity
influence, the annual mean of the meteor echo peak heights showed
a linear decrease of 30 m/year when Mg_II solar index is used and
38 m/year when F10.7 solar radio flux is used. When the trend is
eliminated the relationship between meteor peak heights and F10.7
solar flux indicate a trend of 672 m/100 sfu (sfu-solar flux
unit). The meteor amplitude signals and the decay time drops after
mid-2004, which may be attributed to the decreasing of the
electron density in the meteor trails. The meteor echo peak height
decrease has been interpreted as being caused by a reduction in
air density in the upper atmosphere.",
doi = "10.1016/j.jastp.2015.08.015",
url = "http://dx.doi.org/10.1016/j.jastp.2015.08.015",
issn = "1364-6826",
language = "en",
urlaccessdate = "27 abr. 2024"
}