Maty - I think your maths may be a little out - 2.1 million Km is around 1.3 million miles (I'm old, I can do both, but I'm so much happier in Imperial!) Earth to Sun is about 93 million miles so about a 70th of our distance. This gives approx 5000 times the incident heat/ light we currently experience. Plus there's probably various types of particle thrown off by the sun which aren'tenergetic enough to reach all the way out to here but are more than capable of reaching the spacecraft.