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$\delta$-sunspots are known to be favourable locations for fast and energeticevents like flares and CMEs. The photosphere of this type of sunspots has beenthoroughly investigated in the past three decades. The atmospheric conditionsin the chromosphere are not so well known, however. his study is focused on thechromosphere of a $\delta$-sunspot that harbours a series of fan-shaped jets inits penumbra . The aim of this study is to establish the magnetic fieldtopology and the temperature distribution in the presence of jets in thephotosphere and the chromosphere. We use data from the Swedish 1-m SolarTelescope (SST) and the Solar Dynamics Observatory. We invert thespectropolarimetric FeI 6302~\AA\ and CaII ~8542~\AA\ data from the SST usingthe the non-LTE inversion code NICOLE to estimate the magnetic fieldconfiguration, temperature and velocity structure in the chromosphere. Aloop-like magnetic structure is observed to emerge in the penumbra of thesunspot. The jets are launched from the loop-like structure. Magneticreconnection between this emerging field and the pre-existing vertical field issuggested by hot plasma patches on the interface between the two fields. Theheight at which the reconnection takes place is located between $\log\tau_{500} = -2$ and $\log \tau_{500} = -3$. The magnetic field vector and theatmospheric temperature maps show a stationary configuration during the wholeobservation.

The chromosphere above a $\delta$-sunspot in the presence of fan-shaped jets