Supernova remnants are the primary source of cosmic rays with energies below 10^15 eV. They are created when a massive star explodes at the end of its life, releasing a shock wave that accelerates particles to high energies.

Shock acceleration is the primary mechanism responsible for the production of UHECRs. It occurs when charged particles are accelerated by shock waves in astrophysical environments, such as supernova remnants and active galactic nuclei.

The Blandford-Znajek process is the acceleration mechanism that occurs when charged particles are accelerated by the electric field of a rotating black hole. It is named after Roger Blandford and Roman Znajek, who first proposed the mechanism in 1977.

Fermi acceleration is the primary mechanism responsible for the production of cosmic rays in pulsar wind nebulae. It occurs when charged particles are repeatedly reflected by shock waves in the pulsar wind, gaining energy with each reflection.

Magnetic reconnection is the acceleration mechanism that occurs when charged particles are accelerated by the electric field of a current sheet in a plasma. It is a common mechanism for particle acceleration in astrophysical environments, such as solar flares and coronal mass ejections.

Shock acceleration is the primary mechanism responsible for the production of cosmic rays in active galactic nuclei. It occurs when charged particles are accelerated by shock waves in the jets and outflows from the central black hole.

Centrifugal acceleration is the acceleration mechanism that occurs when charged particles are accelerated by the centrifugal force of a rotating plasma disk. It is a common mechanism for particle acceleration in astrophysical environments, such as accretion disks around black holes and neutron stars.

Inflationary acceleration is the acceleration mechanism that is responsible for the production of cosmic rays in the early universe. It occurs during the inflationary epoch, when the universe underwent a period of rapid expansion.

Double layer acceleration is the acceleration mechanism that occurs when charged particles are accelerated by the electric field of a double layer in a plasma. Double layers are thin regions of plasma with a large electric field, and they are often found in astrophysical environments, such as the Earth's magnetosphere and the solar wind.

Shock acceleration is the primary mechanism responsible for the production of cosmic rays in gamma-ray bursts. It occurs when charged particles are accelerated by shock waves in the relativistic jets that are produced by gamma-ray bursts.

Betatron acceleration is the acceleration mechanism that occurs when charged particles are accelerated by the electric field of a parallel electric and magnetic field. It is a common mechanism for particle acceleration in astrophysical environments, such as the Earth's radiation belts and the solar wind.

Shock acceleration is the primary mechanism responsible for the production of cosmic rays in supernova remnants. It occurs when charged particles are accelerated by shock waves in the expanding supernova remnant.

Pulsar wind acceleration is the acceleration mechanism that occurs when charged particles are accelerated by the electric field of a rotating neutron star. It is a common mechanism for particle acceleration in astrophysical environments, such as pulsar wind nebulae and supernova remnants.

Shock acceleration is the primary mechanism responsible for the production of cosmic rays in the heliosphere. It occurs when charged particles are accelerated by shock waves in the solar wind.

Magnetic reconnection is the acceleration mechanism that occurs when charged particles are accelerated by the electric field of a current sheet in a plasma. It is a common mechanism for particle acceleration in astrophysical environments, such as solar flares and coronal mass ejections.