Hi, May be of interest : Summer Starts with a Simmering Geomagnetic Storm http://www.usgs.gov/blogs/features/usgs_top_story/summer-starts-with-a-simmering-geomagnetic-storm/?from=title The handout I disseminate for reference inquiries, outreach, and during bibliographic instruction sessions : Monitoring the Earth’s Dynamic Magnetic Field http://pubs.usgs.gov/fs/2007/3092/ Enjoy the day, Emily Emily C. Wild Librarian (Physical Scientist) U.S. Geological Survey, Denver Library Denver Federal Center ph: (303) 236-1003 [log in to unmask] USGS Libraries: http://library.usgs.gov Tutorials: http://tinyurl.com/lh3tmua Profile: http://profile.usgs.gov/ecwild