European Space Agency (ESA)http://www.esrin.esa.it/
ESA science programmehttp://sci.esa.int
National Aeronautics & Space Administration (NASA)http://www.nasa.gov/
The Particle Physics and Astronomy Research Councilhttp://www.pparc.ac.uk/
The Royal Society http://www.royalsoc.ac.uk/
Royal Astronomical Societyhttp://www.ras.org.uk/
International Solar Terrestrial Physics (ISTP) http://www-spof.gsfc.nasa.gov/
Magnetosphere Ionosphere & Solar-Terrestrial (MIST)http://www.nerc-bas.ac.uk/public/uasd/mist.html
American Geophysical Union (AGU)http://www.agu.org/
Satellite Situation Center http://sscweb.gsfc.nasa.gov/
Space Physics Data facilityhttp://nssdc.gsfc.nasa.gov/space/
SPace ENVironment Information System http://www.spenvis.oma.be/spenvis/
SWRI Space Physics Resources http://espsun.space.swri.edu/spacephysics/resrc/www.space.htm
Physical Units for Particle Measurements http://satyr.msfc.nasa.gov/TIDE/units.shtml
Oulu Space Physics Textbook http://ostrich.usc.edu/ug/oulu/Welcome/html
Today's space weather http://www.sel.noaa.gov/today.html