\documentclass[10pt]{article}

\usepackage{fullpage}
\usepackage{setspace}
\usepackage{parskip}
\usepackage{titlesec}
\usepackage[section]{placeins}
\usepackage{xcolor}
\usepackage{breakcites}
\usepackage{lineno}
\usepackage{hyphenat}





\PassOptionsToPackage{hyphens}{url}
\usepackage[colorlinks = true,
            linkcolor = blue,
            urlcolor  = blue,
            citecolor = blue,
            anchorcolor = blue]{hyperref}
\usepackage{etoolbox}
\makeatletter
\patchcmd\@combinedblfloats{\box\@outputbox}{\unvbox\@outputbox}{}{%
  \errmessage{\noexpand\@combinedblfloats could not be patched}%
}%
\makeatother


\usepackage{natbib}




\renewenvironment{abstract}
  {{\bfseries\noindent{\abstractname}\par\nobreak}\footnotesize}
  {\bigskip}

\titlespacing{\section}{0pt}{*3}{*1}
\titlespacing{\subsection}{0pt}{*2}{*0.5}
\titlespacing{\subsubsection}{0pt}{*1.5}{0pt}


\usepackage{authblk}


\usepackage{graphicx}
\usepackage[space]{grffile}
\usepackage{latexsym}
\usepackage{textcomp}
\usepackage{longtable}
\usepackage{tabulary}
\usepackage{booktabs,array,multirow}
\usepackage{amsfonts,amsmath,amssymb}
\providecommand\citet{\cite}
\providecommand\citep{\cite}
\providecommand\citealt{\cite}
% You can conditionalize code for latexml or normal latex using this.
\newif\iflatexml\latexmlfalse
\providecommand{\tightlist}{\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}%

\AtBeginDocument{\DeclareGraphicsExtensions{.pdf,.PDF,.eps,.EPS,.png,.PNG,.tif,.TIF,.jpg,.JPG,.jpeg,.JPEG}}

\usepackage[utf8]{inputenc}
\usepackage[english]{babel}



\usepackage{float}








\begin{document}

\title{Mesosphere and Lower Thermosphere changes caused by the July 2, 2019
total Eclipse in South America over the Andes Lidar Observatory, Cerro
Pachon, Chile}



\author[1]{Fabio Vargas}%
\author[2]{Alan Z Liu}%
\author[1]{Gary R. Swenson}%
\author[3]{Carlos Segura}%
\author[4]{Pedro Vega-Jorquera}%
\author[5]{Javier Fuentes}%
\author[6]{Pierre-Dominique Pautet}%
\author[7]{Michael J. Taylor}%
\author[7]{Yucheng Zhao}%
\author[8]{Y. Jade Morton}%
\author[8]{Harrison W Bourne}%
\affil[1]{University of Illinois at Urbana Champaign}%
\affil[2]{Embry-Riddle Aeronautical University}%
\affil[3]{Andes Lidar Observatory}%
\affil[4]{Universidad de La Serena}%
\affil[5]{NOIR Lab, Gemini South Observatory}%
\affil[6]{Utah State Uiversity}%
\affil[7]{Utah State University}%
\affil[8]{University of Colorado Boulder}%


\vspace{-1em}



  
  \date{May 27, 2024}


\begingroup
\let\center\flushleft
\let\endcenter\endflushleft
\maketitle
\endgroup





\selectlanguage{english}
\begin{abstract}
This paper presents the results of a campaign covering a week of
observations around the July 2, 2019, total Chilean eclipse. The eclipse
occurred between 1922--2146 UTC, with complete sun disc obscuration
happening at 2038--2040 UTC (1638--1640 LT) over the Andes Lidar
Observatory (ALO) at
(30.3\$\^{}\textbackslash{}circ\$S,70.7\$\^{}\textbackslash{}circ\$W).
Observations were carried out using ALO instrumentation to observe
eclipse--induced effects on the mesosphere and lower thermosphere region
(MLT) (75--105 km altitude). Several mesosphere-sounding sensors were
utilized to collect data before, during, and after the eclipse,
including a narrow-band resonance-fluorescence 3D winds/temperature Na
lidar with daytime observing capability, a meteor radar observing
horizontal winds continuously, a multi-color nightglow all-sky camera
monitoring the OH(6,2), O\$\_2\$(0,1), O(\$\^{}1S\$), and O(\$\^{}1D\$)
emissions, and a mesosphere temperature mapper (MTM) observing the
OH(6--2) brightness and rotational temperature. We have also utilized
TIMED/SABER temperatures and ionosonde measurements taken at the
University of La Serena's Juan Soldado Observatory. We discuss the
effects of the eclipse in the MLT, which can shed light on a sparse set
of measurements during this type of event. Our results point out several
effects of eclipse--induced changes in the atmosphere below and above
but not directly within the MLT. These effects include an unusual fast,
bow--shaped gravity wave structure in airglow images, MTM brightness as
well as in lidar temperature, strong zonal wind shears above 100 km, the
occurrence of a sporadic E layer around 100 km, and finally variations
in lidar temperature and density and the presence of a descending
sporadic sodium layer near 98 km.%
\end{abstract}%



\sloppy




\selectlanguage{english}
\FloatBarrier
\end{document}

