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• W1560027544 abstract "The biggest observational mystery is the presence in cosmic rays particles with energies about 1021 eV which should be destroyed while travelling through 3°K black body radiation. One possibility is that they are not protons but dust particles containing 1010 or more protons with moderate γ = (1 − vd2/c2)−1/2 about 10–100 (vd being the dust velocity). By analyzing the process of charging for fast grains we obtained that the dust grains travelling through interstellar media will loose their charge during less than 104 s when the dust velocities exceed the thermal electron velocity of interstellar plasma and can not be charged if vd > 0.1 × c. This result excludes dust acceleration by a random walk in magnetic shocks to create relativistic neutral atoms in cosmic rays by a decay of accelerated grains [1]. The grains surrounding pre‐supernova can be accelerated up to γ = 100 by radiation pressure of the light emitted in supernova explosions. Relativistic dust grains will approach the Earth as showers but not as flux constant in time. When approaching the Earth the relativistic dust particles can be destroyed by solar radiation [2] since the solar radiation in the rest frame of relativistic grain corresponds to X‐ray frequency range. For energy larger than critical the δ‐ electrons created inside the dust particles by X‐ray photons will escape the grain and will continuously charge the dust positively until it is disrupted by the large positive dust charge. The critical value γcr such that for γ > γcr the dust particle is destroyed by solar radiation is calculated in the present paper numerically and indicates that for rigid crystalline grains of the size about 1 μm γcr is rather large 4.7 × 104. The obtained results can be used to distinguish the source of cosmic ray showers in the planned measurements of cosmic ray showers from space by a system of detectors on satellites. The disruption of relativistic grains by solar radiation produces small explosions which can be detected." @default.
• W1560027544 created "2016-06-24" @default.
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• W1560027544 date "2002-01-01" @default.
• W1560027544 modified "2023-10-16" @default.
• W1560027544 title "Relativistic Dust Particles Approaching the Earth as Highest Energy Cosmic Rays" @default.
• W1560027544 doi "https://doi.org/10.1063/1.1527821" @default.
• W1560027544 hasPublicationYear "2002" @default.
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