Explanation of image.
The figure -- shows at top (A) an image which is the result of the addition of 40 images of 4 sec each recorded at 2.3 microns. The image at bottom (B) is in false color and logarithmic scale. It corresponds to the same image than (A) after deconvolution (40 iteration of Richardson-Lucy) and re-orientation to get the Io's polar axis vertical. Several hot-spots are visible, the most predominant beeing Loki and Kanehekili. The diffraction limit is reached at this wavelength and the resulting resolution on Io is about 400 km for one resolution element. Diffraction rings are visible on the top image (A) around Loki and Kanehekili. The other active regions corresponds to various known calderas on Io except for one region that is still unamed.
Image A (top) Diffration limited image of Io in eclipse showing several active volcanoes on the its Jupiter facing hemisphere. The image was recorded on June 16, 1997 at 2.3 micron using the UH AO system on CFHT.
Image B (bottom) Same image than above but after deconvolution using Amalthea as a PSF. The image is in false color and logarithmic scale in order to enhance the faintest sources. It is re-oriented with the Io's rotation axis displayed vertically. The name of the corresponding calderas on Io is reported. One of the active hot spot corresponds to a region on Io that is still unamed.