  The Sun Coronal Ejection Tracker (SunCET) is an extreme ultraviolet imager
and spectrograph instrument concept for tracking coronal mass ejections through
the region where they experience the majority of their acceleration: the
difficult-to-observe middle corona. It contains a wide field of view (0-4~\Rs)
imager and a 1~\AA\ spectral-resolution-irradiance spectrograph spanning
170-340~\AA. It leverages new detector technology to read out different areas
of the detector with different integration times, resulting in what we call
"simultaneous high dynamic range", as opposed to the traditional high dynamic
range camera technique of subsequent full-frame images that are then combined
in post-processing. This allows us to image the bright solar disk with short
integration time, the middle corona with a long integration time, and the
spectra with their own, independent integration time. Thus, SunCET does not
require the use of an opaque or filtered occulter. SunCET is also compact --
$\sim$15 $\times$ 15 $\times$ 10~cm in volume -- making it an ideal instrument
for a CubeSat or a small, complementary addition to a larger mission. Indeed,
SunCET is presently in a NASA-funded, competitive Phase A as a CubeSat and has
also been proposed to NASA as an instrument onboard a 184 kg Mission of
Opportunity.

Solar and Stellar Astrophysics;Instrumentation and Methods for Astrophysics