Hello Paul, I think Taryn Lopez, an AVO geoscientist and professor at the University of Alaska Fairbanks, is best able to assist you with this information - here is her website with contact information: https://sites.google.com/alaska.edu/tarynlopez/ Thank you, cheryl I am a second year geography and natural hazards student at Coventry university. I am trying to research data for the 2009 Redoubt eruption and have seen that you have SO2 data sets (specifically from OMI) collected and I was wondering if this is available for me to access?