particle acceleration tagged posts

This composite image of the Crab Nebula was assembled with arbitrary color scaling by combining data from five telescopes spanning nearly the entire electromagnetic spectrum. (Image credits: NASA, ESA, NRAO/AUI/NSF and G. Dubner/University of Buenos Aires)

New research revealed that the entire zoo of electromagnetic radiation from the Crab nebula has its origin in one population of electrons and must be produced in a different way than traditionally thought. The results have implications for our understanding of how cosmic rays attain their incredible energies. Discovered more than 100 years ago and considered a potential health risk to airplane crews and astronauts, cosmic rays are believed to be produced by shock waves -eg. those resulting from supernova explosions...

The MMS satellites encounter a shock wave that forms when a fast wind of charged particles from the Sun slams into Earth’s magnetic field. Credit: APS/Carin Cain

In a new study researchers at the Swedish Institute of Space Physics have used measurements from NASA’s MMS (Magnetospheric MultiScale) satellites to reveal that there are ripples, or surface waves, moving along the surface of shocks in space. Such ripples in shocks can affect how plasma is heated and are potential sites of particle acceleration.

Most visible matter in the Universe consists of ionized gas known as plasma. Shock waves in plasmas form around planets, stars and supernovas. Shocks in supernova explosions are thought to be the main source of cosmic rays – very high energy charged particles from space...