Suprathermal grains - Origin of primary cosmic rays

Details Suprathermal grains - Origin of primary cosmic rays Suprathermal grains - Origin of primary cosmic rays

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..59..347d&link_type=abstract

Astrophysics and Space Science, vol. 59, no. 2, Dec. 1978, p. 347-354.

Astronomy and Astrophysics

Astrophysics

10

Cosmic Dust, Intergalactic Media, Particle Acceleration, Primary Cosmic Rays, Relativistic Particles, Charged Particles, Energy Dissipation, Magnetic Pumping, Particle Collisions, Thermal Energy

Scientific paper

Charged dust grains with radii of about 3 millionths cm could be a help in understanding the production of primary cosmic-ray particles in extensive air showers (EAS). A two-stage acceleration mechanism is proposed for accelerating dust grains up to relativistic energy. In the first stage, dust grains acquire suprathermal energy ('suprathermal grains') by the Fermi mechanism. In the second stage, suprathermal grains attain relativistic energy by the Alfven magnetic-pumping mechanism, yielding the primary cosmic-ray particles. Ionization loss has been considered to be a most important loss mechanism for charged dust grains in a fully ionized medium. It is suggested that graphite dust grains of intergalactic origin may be responsible for high-energy (greater than 10 to the 20th eV) cosmic rays.

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