Recently there appeared a paper about

an antiproton ring around the earth.

http://www.technologyreview.com/view/424922/antiproton-radiation-belt-discovered-around-earth/

http://arxiv.org/abs/1107.4882

Regards,

Joachim

AMS-2 (installed on the ISS) is observing the flux of positrons, anti-neutrons, anti-protons and anti-alpha particles (anti-HE-4). To date they have only published results on positrons http://arxiv.org/abs/1402.0437 , but they are measuring the rest, and I been told that these results are likely to be pretty note-worthy. 

Dear Joachim and Marshall, thanks for your answers. Is it likely that those new findings will alter our understanding of the solar system? Best wishes

Victor, if by anti-hydrogen and anti-helium, you mean neutral anti-atoms, then there's no obvious experimental test to distinguish them from regular atoms. The only observational clue would be via annihilations with matter. Presently there's no gamma-ray source of the right spectral characteristics that's observed in the Solar System. Thus there's no neutral antimatter in our Solar System that we can observe.

However, as Marshall Eubanks can confirm, there are good reasons to think there might be antimatter quark-matter remnants in our Solar System, from the very earliest epochs of the Cosmos. Such quark matter would be resistent to annihilation with regular matter unless it impacted at high speed (a significant fraction of the speed of light.) Can it be observed? Possibly, but look up Marshall's papers here on ResearchGate for more details.

Thank you, Adam, for your answer. Ok i will read Marshall's paper. Best wishes

Yes, such detection is possible. Please see the work being done at the CERN site.

http://home.web.cern.ch/about/updates/2014/06/cerns-alpha-experiment-measures-charge-antihydrogen

Thanks, Joseph. Best wishes

There is no way to detect the antihelium nuclei in cosmic rays and even in the heavy ion colliders due to the infinitesimal survival and production probability respectively. The antihydrogen nuclei, with nickname - antiprotons, are generated in cosmic rays (and accelerators: CERN, Fermilab) mostly via p+A→p-+X reactions and were detected in the balloon-borne experiments (BESS, HEAT) and space-based experiments (AMS, PAMELA).