  The Sun cubE onE (SEE) is a 12U CubeSat mission proposed for a phase A/B
study to the Italian Space Agency that will investigate Gamma and X-ray fluxes
and ultraviolet (UV) solar emission to support studies in Sun-Earth interaction
and Space Weather from LEO. More in detail, SEE's primary goals are to measure
the flares emission from soft-X to Gamma ray energy range and to monitor the
solar activity in the Fraunhofer Mg II doublet at 280 nm, taking advantage of a
full disk imager payload. The Gamma and X-ray fluxes will be studied with
unprecedented temporal resolution and with a multi-wavelength approach thanks
to the combined use of silicon photodiode and silicon photomultiplier (SiPM)
-based detectors. The flare spectrum will be explored from the keV to the MeV
range of energies by the same payload, and with a cadence up to 10 kHz and with
single-photon detection capabilities to unveil the sources of the solar flares.
The energy range covers the same bands used by GOES satellites, which are the
standard bands for flare magnitude definition. At the same time SiPM detectors
combined with scintillators allow to cover the non-thermal bremsstrahlung
emission in the gamma energy range. Given its UV imaging capabilities, SEE will
be a key space asset to support detailed studies on solar activity, especially
in relation to ultraviolet radiation which strongly interacts with the upper
layers of the Earth's atmosphere, and in relation to space safety, included in
the field of human space exploration. The main goal for the UV payload is to
study the evolution of the solar UV emission in the Mg II band at two different
time scales: yearly variations along the solar cycle and transient variations
during flare events.
