NEREA is a stable, compact, high-resolution spectrometer concept for the GTC. NEREA is proposed as a general purpose instrument with a variety of science cases, however, its top level requirements are driven by two science goals in mind: i) The discovery and characterization of planets around nearby late-M type stars. Using GTC's large 10m

Understanding the connection between solar atmospheric layers through the magnetic field is a challenging task in solar physics. These regions are form by plasma weakly ionized and in some places the ionization fraction can be as low as 10^-4 meaning that the presence of neutrals could be important. The interaction of weakly ionized plasma with