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One important feature of sunspots is the presence of light bridges. Thesestructures are elongated and bright (as compared to the umbra) features thatseem to be related to the formation and evolution of sunspots. In this work, westudied the long-term evolution and the stratification of different atmosphericparameters of three light bridges formed in the same host sunspot by differentmechanisms. To accomplish this, we used data taken with the GREGOR InfraredSpectrograph installed at the GREGOR telescope. These data were inverted toinfer the physical parameters of the atmosphere where the observed spectralprofiles were formed of the three light bridges. We find that, in general, thebehaviour of the three light bridges is typical of this kind of structure withthe magnetic field strength, inclination, and temperature values between thevalues at the umbra and the penumbra. We also find that they are of asignificantly non-magnetic character (particularly at the axis of the lightbridges) as it is deduced from the filling factor. In addition, within thecommon behaviour of the physical properties of light bridges, we observe thateach one exhibits a particular behaviour. Another interesting result is thatthe light bridge cools down, the magnetic field decreases, and the magneticfield lines get more inclined higher in the atmosphere. Finally, we studied themagnetic and non-magnetic line-of-sight velocities of the light bridges. Theformer shows that the magnetic component is at rest and, interestingly, itsvariation with optical depth shows a bi-modal behaviour. For the line-of-sightvelocity of the non-magnetic component, we see that the core of the lightbridge is at rest or with shallow upflows and clear downflows sinking throughthe edges.

Long-Term Evolution of Three Light Bridges Developed on the Same Sunspot