Hello, I am working in an experiment proposal for a contest at CERN, and I need reliable data about the Polar Aurora. The experiment consist in using a T9 beam to produce radiation similar to the Sun's radiation and irradiate with it a capsule with gas in conditions as close as possible to the atmosphere at the altitude where Auroras happen. The problem is the part of "similar to the Sun's radiation", because I can't find reliable data, every source has different information. Firstly it seems that nobody agrees if the ions take part in the Aurora or if it's just the electrons. Secondly the speed of the electrons, some sources say it is c/10, others 1000 km/s, other 400 km/s. And finally nobody agrees about the red auroras, some sources say they occur way higher in the atmosphere that the green ones, others say they happen after the green ones, and some people say that it only depends on the gases that are there. I have searched a lot but all the good articles are very expensive, besides they are kind of old and I don't even know if they will have the information I need. The reason I need this information is because I want to know how many GeVs the beam has to produce and what kind of target do we need to hit in order to produce the radiation needed, I don't want too energetic particles but also I don't want particles not energetic enough. Thanks.