High-precision density measurements in the solar corona
High-precision density measurements in the solar corona
<i>Aims. <i/>The EUV Imaging Spectrometer (EIS) instrument on board the <i>Hinode<i/> satellite has access to some of the best coronal density diagnostics, and the high sensitivity of the instrument now allows electron number density, <i>N<i/><sub>e<sub/>, measurements to an unprecedented precision of up to <i>±<i/>5% in active regions. This paper gives …