# Source of high energy cosmic particles

Earth receives shower of both solar and cosmic radiations every seconds. The Sun put up a heliosphere around the solar system and thus foreign high energy charged particles could not penetrate easily. Is there any other source most probably that lies within our solar system?

Note:

1. Very high energy cosmic particle beyond 5.7 x 10^19 eV were observed by Pierre Auger Observatory in Argentina. (rare but the GZK limit seems to rule out distance sources)
2. GZK limit roughly capped the upper energy level of cosmic ray as they are slowed due to CMB over vast distance
• You many need to be more specific. The sun emits a large number of (high energy) particles, including neutrinos and alpha particles. This is generally known as the solar wind. Particles interacting with our atmosphere can also produce high-energy particles. Are there particular kinds of particles, or particular energy scales, you wish to focus on? Apr 10 '15 at 1:45
• @zibadawa Timmy see note Apr 10 '15 at 3:14
• GZK limit rules out sources further than ~160 million light years - there's no way particles of similar energy could be created in solar system. Apr 10 '15 at 11:48
• Our Galaxy has only 100 thousand light years; even our whole Virgo Supercluster has only 110 million light-years diameter so it could come from outside of it. Apr 10 '15 at 13:00
• arxiv.org/abs/1411.0704 Apr 11 '15 at 1:32

Normally, the two main sources of cosmic rays are considered to be the Sun (solar energetic particles) and galactic or extragalactic sources, although extragalactic sources are more common. Surprisingly, though, there is a third source, a family of particles known as anomalous cosmic rays (see Hovestadt et al. (1973) and Garcia-Munoz et al. (1973)). These are particles - generally ionized nuclei of lighter elements - primarily originating from interstellar space with energies on the order of $\sim10$ to $\sim10^2\text{ MeV}$.