Fig. 2: The JWST NIRSpec observations of Neptune.
From: Discovery of \({{\bf{H}}}_{\mathbf{3}}^{\mathbf{+}}\) and infrared aurorae at Neptune with JWST
a,b, The spatial distribution of reflective clouds, seen clearly at 3 μm across the disk for longitude 1 (a) and longitude 2 (b). The latitude and longitude grids have spacings of 15°. c,d, The spatial distribution of the sum of the brightest \({{\rm{H}}}_{3}^{+}\) emission lines in Fig. 1. The grey areas show the regions of highly reflective clouds from which the \({{\rm{H}}}_{3}^{+}\) intensity cannot be extracted. d shows an enhancement in the southern hemisphere, appearing in the post-noon sector on the right. This is generated by enhanced \({{\rm{H}}}_{3}^{+}\) column density, probably indicative of localized auroral precipitation.
