  The mid-infrared (mid-IR) range has been mostly unexplored for the
investigation of solar flares. It is only recently that new mid-IR flare
observations have begun opening a new window into the response and evolution of
the solar chromosphere. These new observations have been mostly performed by
the AR30T and BR30T telescopes that are operating in Argentina and Brazil,
respectively. We present the analysis of SOL2019-05-15T19:24, a GOES class C2.0
solar flare observed at 30~THz (10$\ \mu$m) by the ground-based telescope
AR30T. Our aim is to characterize the evolution of the flaring atmosphere and
the energy transport mechanism in the context of mid-IR emission. We performed
a multi-wavelength analysis of the event by complementing the mid-IR data with
diverse ground- and space-based data from the Solar Dynamics Observatory (SDO),
the H--$\alpha$ Solar Telescope for Argentina (HASTA), and the Expanded Owens
Valley Solar Array (EOVSA). Our study includes the analysis of the magnetic
field evolution of the flaring region and of the development of the flare. The
mid-IR images from AR30T show two bright and compact flare sources that are
spatially associated with the flare kernels observed in ultraviolet (UV) by
SDO. We confirm that the temporal association between mid-IR and UV fluxes
previously reported for strong flares is also observed for this small flare.
The EOVSA microwave data revealed flare spectra consistent with thermal
free-free emission, which lead us to dismiss the existence of a significant
number of non-thermal electrons. We thus consider thermal conduction as the
primary mechanism responsible for energy transport. Our estimates for the
thermal conduction energy and total radiated energy fall within the same order
of magnitude, reinforcing our conclusions.
