There are two new Io-related papers just posted to Icarus's Articles-in-Press page. In Press articles are papers that have been approved for publication but have not found a spot in the printed journal. The first paper, Io's dayside SO2 atmosphere by Lori M. Feaga, Melissa McGrath, and Paul D. Feldman, covers Hubble Space Telescope observations of Io's atmosphere in the UV. The second paper, Formation of mountains on Io: Variable volcanism and thermal stresses by Michelle R. Kirchoff and William B. McKinnon, reports on modeling of Io's lithosphere and how its tectonics varies as a result of volcanic variability.
I'll post summaries of these two papers here tomorrow and Monday.