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\begin{document}

\title{Polar Cap Boundary identification using redline optical data and DMSP
satellite particle data}



\author[1]{Bea Gallardo-Lacourt}%
\author[2]{Simon Wing}%
\author[3]{Larry Kepko}%
\author[4]{Deborah Megan Gillies}%
\author[4]{Emma Spanswick}%
\author[4]{Elizabeth Roy}%
\author[4]{Eric Donovan}%
\affil[1]{NASA GSFC}%
\affil[2]{Johns Hopkins University}%
\affil[3]{NASA Goddard Space Flight Center}%
\affil[4]{University of Calgary}%


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  \date{May 25, 2024}


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\begin{abstract}
\textbackslash{}justify The location of the polar cap boundary is
typically determined using low-orbit satellite measurements in which the
boundary is identified by its unique signature of a sharp decrease in
energy and particle flux poleward of the auroral oval. In principle,
this decrease in precipitating particles should appear as a concomitant
sharp change in auroral luminosity. Based on a few events,
(missing citation) suggested that a dramatic gradient in redline aurora
may also be an indicator of the polar cap boundary. In recent years,
advances in capabilities and the deployment of ground-based all-sky
imagers have ushered in a new era of auroral measurements. Auroral
imaging has moved well beyond the capabilities of the instrumentation in
the previous study in terms of both spatial and temporal resolution. We
now have access to decades of optical data from arrays spanning a huge
spatial range, enabling a fresh examination of the relationship between
redline aurora, particle precipitation, and the polar cap open closed
boundary. In this study, we use data from the DMSP satellites in
conjunction with the University of Calgary's REGO (630.0nm) data to
assess the viability of automated detection of the 2-dimensional polar
cap boundary. Our results exhibit good agreement between the optical and
particle polar cap boundary and suggest that a luminosity in redline
emission could serve as a reasonable proxy for the location of the the
electron poleward boundary during, while providing both high temporal
and spatial resolution maps of the open-closed boundary.%
\end{abstract}%



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