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While the longitudinal field that dominates photospheric network regions hasbeen studied extensively, small scale transverse fields have recently beenfound to be ubiquitous in the quiet internetwork photosphere. Few observationshave captured how this field evolves. We aim to statistically characterise themagnetic properties and observe the temporal evolution of small scale magneticfeatures. We present two high spatial/temporal resolution observations thatreveal the dynamics of two disk centre internetwork regions taken by the newGRIS/IFU (GREGOR Infrared Spectrograph Integral Field Unit) with the highlymagnetically sensitive Fe I line pair at 15648.52 {\AA} and 15652.87 {\AA}.With the SIR code, we consider two inversion schemes: scheme 1 (S1), where amagnetic atmosphere is embedded in a field free medium, and scheme 2 (S2), withtwo magnetic models and a fixed stray light component. S1 inversions returned amedian magnetic field strength of 200 and 240 G for the two datasets,respectively. We consider the median transverse (horizontal) component, amongpixels with Stokes Q or U, and the median unsigned longitudinal (vertical)component, among pixels with Stokes V, above a noise threshold. We determinedthe former to be 263 G and 267 G, and the latter to be 131 G and 145 G, for thetwo datasets, respectively. We present three regions of interest (ROIs),tracking the dynamics of small scale magnetic features. We apply S1 and S2inversions to specific profiles, and find S2 produces better approximationswhen there is evidence of mixed polarities. We find patches of linearpolarization with magnetic flux density between 130 and 150 G, appearingpreferentially at granule/intergranular lane (IGL) boundaries. The weak hGmagnetic field appears to be organised in terms of complex loop structures,with transverse fields often flanked by opposite polarity longitudinal fields.

Temporal evolution of small-scale internetwork magnetic fields in the solar photosphere