1 2 Geomagnetic Data Service World Data Center for Geomagnetism, Kyoto ↑ Helmholtz Centre PotsdamGFZ German Research Centre for Geosciences ↑ List of solar observatories ↑ Global Oscillation Network Group home page ↑ "Under Sunveillance". physics.org. Retrieved 12 September 2012. ↑ "Solar-Heliospheric-Ionospheric Science".