Theoretical models are in general not directly accessible on the internet since the require considerable computer resources and close collaboration with the model authors. Knowledge of these distributions is important in many areas of magnetospheric, ionospheric, and thermospheric physics. My personal favorite are the Space Weather Resources pages compiled at Rice University. It includes links to real-time data sources, to models, to eductional pages and many more. Information about the current space weather can be found at Space Weather Today of the University of Michigan, Rice University and NBC's Channel 4 and at NOAA's Space Environment Center .
Solar indices are an essential input for most atmospheric and ionospheric models.
Predictions of future atmospheric conditions therefore depends critically on predictions of solar indices during this time period. Magnetic indices and real-time magnetometer data are available from the WDC in Kyoto , Japan. Another interesting link is to a Chart that Links Solar, Geophysical Events With Impacts on Space Technologies . The WWW also provides access to a number of interactive systems that assist and support campaign and mission planning. The SPDF's SSCWeb provides important tools for determing potential campaign periods.