The PAMELA instrument detected antimatter particles in the Earth's magnetosphere. What are the sources of these particles?

The answer to Source of high energy cosmic particles outlines the sources of cosmic rays in general, does it still hold true for antimatter particles?

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    $\begingroup$ Anywhere where highly energetic reactions take place whose center-of-mass energy surpasses the rest-mass energy of 2*times some particle, this particle and its anti-particle counterpart can be created. $\endgroup$ – AtmosphericPrisonEscape Apr 17 at 17:22
  • $\begingroup$ I don't know if this can put antiparticles into the magnetosphere, but it's cool and weird: en.wikipedia.org/wiki/Terrestrial_gamma-ray_flash $\endgroup$ – uhoh Apr 18 at 0:52
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    $\begingroup$ Positrons can be created when cosmic ray particles collide with particles in the interplanetary (or interstellar) medium. There's some relevant info in this article from 1998, but I expect that our knowledge on this topic has expanded somewhat since then. ;) And of course experiments like PAMELA are designed to gather data to help decide between competing hypotheses. $\endgroup$ – PM 2Ring Apr 18 at 4:31

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