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\begin{document}

\title{Observations of mesospheric gravity waves generated by geomagnetic
activity}



\author[1]{Viswanathan Lakshmi Narayanan}%
\author[1]{Corwin James Wright}%
\author[2]{Martin G. Mlynczak}%
\author[1]{Neil P Hindley}%
\author[3]{Andrew John Kavanagh}%
\author[3]{Tracy Moffat-Griffin}%
\author[1]{Phoebe E Noble}%
\affil[1]{University of Bath}%
\affil[2]{NASA Langley Research Center}%
\affil[3]{British Antarctic Survey}%


\vspace{-1em}



  
  \date{June 15, 2024}


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\selectlanguage{english}
\begin{abstract}
\hyperref[csl:1]{(Narayanan et al., 2024)}Gravity waves (GWs) play an important role in the
dynamics and energetics of the mesosphere. Geomagnetic activity is a
known source of GWs in the upper atmosphere. However, how deep the
effects of geomagnetic activity induced GWs penetrate into the
mesosphere remains an open question. We use temperature measurements
from the SABER/TIMED instrument between 2002 - 2018 to study the
variations of mesospheric GW activity following intense geomagnetic
disturbances identified by AE and Dst indices. By considering several
case studies, we show for the first time that the GWs forced by
geomagnetic activity can propagate down to about 80 km in the high
latitude mesosphere. Only regions above 55\selectlanguage{ngerman}° latitudes show a clear
response. The fraction of cases in which there is an unambiguous
enhancement in GW activity following the onset of geomagnetic
disturbance is smaller during summer than other seasons. Only about half
of the events show an unambiguous increase in GW activity during
non-summer periods and about one quarter of the events in summer show an
enhancement in GWs. In addition, we also find that the high latitude
mesopause is seen to descend in altitude following onset of geomagnetic
activity in the non-summer high latitude region.%
\end{abstract}\selectlanguage{ngerman}%



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\section*{References}\sloppy
\phantomsection
\label{csl:1}{Observations of Mesospheric Gravity Waves Generated by Geomagnetic Activity}. (2024). \textit{Journal of Geophysical Research: Space Physics}, \textit{129}(4). \url{https://doi.org/10.1029/2023ja032157}

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