NOAA Space Environment Center -- The official U.S. government bureau for real-time monitoring of solar and geophysical events, research in solar-terrestrial physics, and forecasting solar and geophysical disturbances.
Atmospheric Optics -- the first place to look for information about sundogs, pillars, rainbows and related phenomena. See also Snow Crystals.
Solar and Heliospheric Observatory -- Realtime and archival images of the Sun from SOHO. (European Mirror Site)
Daily Sunspot Summaries -- from the NOAA Space Environment Center.
Current Solar Images --a gallery of up-to-date solar pictures from the National Solar Data Analysis Center at the Goddard Space Flight Center. See also the GOES-12 Solar X-ray Imager.
Recent Solar Events -- a nice summary of current solar conditions from lmsal.com.
SOHO Farside Images of the Sun from SWAN and MDI.
The Latest SOHO Coronagraph Images -- from the Naval Research Lab
The Sun from Earth -- daily images of our star from the Big Bear Solar Observatory
List of Potentially Hazardous Asteroids -- from the Harvard Minor Planet Center.
Observable Comets -- from the Harvard Minor Planet Center.
What is the Interplanetary Magnetic Field? -- A lucid answer from the University of Michigan. See also the Anatomy of Earth's Magnetosphere.
Real-time Solar Wind Data -- from NASA's ACE spacecraft. How powerful are solar wind gusts? Read this story from Science@NASA.
More Real-time Solar Wind Data -- from the Solar and Heliospheric Observatory Proton Monitor.
Aurora Forecast --from the University of Alaska's Geophysical Institute
Daily Solar Flare and Sunspot Data -- from the NOAA Space Environment Center.
Lists of Coronal Mass Ejections -- from 1998 to 2001
What is an Iridium flare? See also Photographing Satellites by Brian Webb.
What is an Astronomical Unit, or AU?
Mirages: Mirages in Finland; An Introduction to Mirages;
NOAA Solar Flare and Sunspot Data: 1999; 2000; 2001; 2002; 2003; 2004; Jan-Mar., 2005;
Space Audio Streams: (University of Florida) 20 MHz radio emissions from Jupiter: #1, #2, #3, #4; (NASA/Marshall) INSPIRE: #1; (Stan Nelson of Roswell, New Mexico) meteor radar: #1, #2;
Recent International Astronomical Union Circulars
GLOSSARY | SPACE WEATHER TUTORIAL