Pegasus/OSC Launch of HESSI
- Includes mission summary and video from the launch.
- http://science.ksc.nasa.gov/payload/missions/hessi/

RHESSI Education and Public Outreach
- Includes news summary, sun science information, a photo gallery, and K-12 curriculum activities.
- http://cse.ssl.berkeley.edu/hessi_epo/

RHESSI at NASA Goddard Space Flight Center
- Offers project current news, data, software and bug reporting, and science summaries.
- http://hesperia.gsfc.nasa.gov/hessi/

HESSI at Berkeley
- Information on the High Energy Solar Spectroscopic Imager, a NASA Small Explorer mission, including proposal details, scientific objectives, fabrication, testing, and launch photos.
- http://hessi.ssl.berkeley.edu/