Proton acceleration in flares and magnetohydrodynamic solar activity

V. N. Tsytovich, R. Bingham, U. de Angelis, D. A. Bryant, C. M. C. Nairn

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The possibility of accelerated protons in solar flares having a sharp change in their spectral index is discussed. The analysis is based on the Tsytovich (1982, 1984, 1987a, b, c) acceleration model by MHD turbulence, which is shown to have different resonant conditions for non-relativistic and relativistic particles. The different resonant condition is shown to result in a sharp change in the accelerated proton spectral index, even in the absence of any peculiarity in the spectra of the MHD turbulence. Time scales for accelerated protons to relativistic energies are also derived, and shown to be consistent with observations. We also show that the threshold energy for electron acceleration by low frequency MHD turbulence is much greater than for proton acceleration. The turbulence therefore preferentially accelerates protons.
LanguageEnglish
Pages329-335
Number of pages7
JournalSolar Physics
Volume147
Issue number2
DOIs
Publication statusPublished - 1 Oct 1993

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magnetohydrodynamics
solar activity
flares
turbulence
protons
electron acceleration
relativistic particles
energy
solar flares
timescale
electron
low frequencies
thresholds
index

Keywords

  • accelerated protons
  • solar flares
  • spectral index
  • resonance
  • MHD turbulence
  • electron acceleration
  • proton acceleration

Cite this

Tsytovich, V. N., Bingham, R., Angelis, U. D., Bryant, D. A., & Nairn, C. M. C. (1993). Proton acceleration in flares and magnetohydrodynamic solar activity. Solar Physics, 147(2), 329-335. https://doi.org/10.1007/BF00690722
Tsytovich, V. N. ; Bingham, R. ; Angelis, U. de ; Bryant, D. A. ; Nairn, C. M. C. / Proton acceleration in flares and magnetohydrodynamic solar activity. In: Solar Physics. 1993 ; Vol. 147, No. 2. pp. 329-335.
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Tsytovich, VN, Bingham, R, Angelis, UD, Bryant, DA & Nairn, CMC 1993, 'Proton acceleration in flares and magnetohydrodynamic solar activity' Solar Physics, vol. 147, no. 2, pp. 329-335. https://doi.org/10.1007/BF00690722

Proton acceleration in flares and magnetohydrodynamic solar activity. / Tsytovich, V. N.; Bingham, R.; Angelis, U. de; Bryant, D. A.; Nairn, C. M. C.

In: Solar Physics, Vol. 147, No. 2, 01.10.1993, p. 329-335.

Research output: Contribution to journalArticle

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