Experimental Astronomy

, Volume 33, Issue 2, pp 237–269

Solar Particle Acceleration Radiation and Kinetics (SPARK)

A mission to understand the nature of particle acceleration


    • UCL Mullard Space Science Laboratory
  • David R. Williams
    • UCL Mullard Space Science Laboratory
  • Karl-Ludwig Klein
    • LESIA, Observatoire de Paris-Meudon
  • Eduard P. Kontar
    • SUPA, School of Physics & AstronomyUniversity of Glasgow
  • David M. Smith
    • UC Santa Cruz
  • Andreas Lagg
    • MPS
  • Sam Krucker
    • UC Berkeley
    • University of Applied Sciences, North Western Switzerland (FHNW)
  • Gordon J. Hurford
    • Space Sciences Lab. UC Berkeley
  • Nicole Vilmer
    • LESIA, Observatoire de Paris-Meudon
  • Alexander L. MacKinnon
    • SUPA, School of Physics & AstronomyUniversity of Glasgow
  • Valentina V. Zharkova
    • University of Bradford
  • Lyndsay Fletcher
    • SUPA, School of Physics & AstronomyUniversity of Glasgow
  • Iain G. Hannah
    • SUPA, School of Physics & AstronomyUniversity of Glasgow
  • Philippa K. Browning
    • University of Manchester
  • Davina E. Innes
    • MPS
  • Gerard Trottet
    • LESIA, Observatoire de Paris-Meudon
  • Clare Foullon
    • University of Warwick
  • Valery M. Nakariakov
    • University of Warwick
  • Lucie M. Green
    • UCL Mullard Space Science Laboratory
  • Herve Lamoureux
    • UCL Mullard Space Science Laboratory
  • Colin Forsyth
    • UCL Mullard Space Science Laboratory
  • David M. Walton
    • UCL Mullard Space Science Laboratory
  • Mihalis Mathioudakis
    • Queen’s University Belfast
  • Achim Gandorfer
    • MPS
  • Valentin Martinez-Pillet
    • Instituto de Astrofisica de Canarias
  • Olivier Limousin
    • CEA Saclay
  • Erwin Verwichte
    • University of Warwick
  • Silvia Dalla
    • UCLan
  • Gottfried Mann
    • AIP
  • Henri Aurass
    • AIP
  • Thomas Neukirch
    • University of St. Andrews
Original Article

DOI: 10.1007/s10686-011-9260-3

Cite this article as:
Matthews, S.A., Williams, D.R., Klein, K. et al. Exp Astron (2012) 33: 237. doi:10.1007/s10686-011-9260-3


Energetic particles are critical components of plasma populations found throughout the universe. In many cases particles are accelerated to relativistic energies and represent a substantial fraction of the total energy of the system, thus requiring extremely efficient acceleration processes. The production of accelerated particles also appears coupled to magnetic field evolution in astrophysical plasmas through the turbulent magnetic fields produced by diffusive shock acceleration. Particle acceleration is thus a key component in helping to understand the origin and evolution of magnetic structures in, e.g. galaxies. The proximity of the Sun and the range of high-resolution diagnostics available within the solar atmosphere offers unique opportunities to study the processes involved in particle acceleration through the use of a combination of remote sensing observations of the radiative signatures of accelerated particles, and of their plasma and magnetic environment. The SPARK concept targets the broad range of energy, spatial and temporal scales over which particle acceleration occurs in the solar atmosphere, in order to determine how and where energetic particles are accelerated. SPARK combines highly complementary imaging and spectroscopic observations of radiation from energetic electrons, protons and ions set in their plasma and magnetic context. The payload comprises focusing-optics X-ray imaging covering the range from 1 to 60 keV; indirect HXR imaging and spectroscopy from 5 to 200 keV, γ-ray spectroscopic imaging with high-resolution LaBr3 scintillators, and photometry and source localisation at far-infrared wavelengths. The plasma environment of the regions of acceleration and interaction will be probed using soft X-ray imaging of the corona and vector magnetography of the photosphere and chromosphere. SPARK is designed for solar research. However, in addition it will be able to provide exciting new insights into the origin of particle acceleration in other regimes, including terrestrial gamma-ray flashes (TGF), the origin of γ-ray bursts, and the possible existence of axions.


Sun: atmosphereParticle accelerationSpace missions: instrumentsESA Cosmic vision

Copyright information

© Springer Science+Business Media B.V. 2011