Space Weather threatening astronauts at  ISS?
Earth and satellites are attacked by a proton storm. The >10MeV proton flux exceeded the threshold of 10 particles several times since Dec 06. On Dec 09, the space shuttle was launched and brought more people to the international space station. They return on Dec 21.
Nederlandstalige versie posted: December 15, 2006

According to the NOAA Space Weather scales , we are now dealing with a S1 solar radiation storm. This scale is based on the >10MeV flux curve only, other physical quantities are not taken into account. The biological influence of an S1 event is described as 'none'.

From this point of view, the astrononauts are not in danger. But not all physics is put into this picture. There are many other factors determining the level of danger. For example, the time duration of the exposure to high energy radiation is also relevant. Another example: a high energy particle impings on the spacecraft, the ISS and produces secondairy particles which can be more harmfull then the primairy particle.

The point is that the exact influence on the human health is not known yet. Just be carefull when you are in space! I don't trust it.

The picture above shows the flux of protons with energies above 10 MeV, 50 MeV and 100 MeV. eV is a measure for energy. A particle flux denotes how many particles cross a certain surface per second. It's the satellite GOES that measures this proton flux.