Observations of Active Region Loops with the EUV Imaging Spectrometer on <i>Hinode</i>
Observations of Active Region Loops with the EUV Imaging Spectrometer on <i>Hinode</i>
Previous solar observations have shown that coronal loops near 1 MK are difficult to reconcile with simple heating models. These loops have lifetimes that are long relative to a radiative cooling time, suggesting quasi-steady heating. The electron densities in these loops, however, are too high to be consistent with thermodynamic …