A dominant role for protons at the onset of solar flares

Details A dominant role for protons at the onset of solar flares A dominant role for protons at the onset of solar flares

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..106..165s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 106, July 1986, p. 165-183.

Physics

54

Particle Acceleration, Solar Corona, Solar Flares, Solar Protons, Electron Energy, Gamma Rays, Plasma Turbulence, Shock Waves, Solar X-Rays

Scientific paper

The energetics of the onset of the impulsive phase of solar flares are examined on the premise that a single acceleration mechanism is operating in the corona. From considerations of recent observations of plasma turbulence and upflows, and nuclear gamma-rays it is concluded that a model where the bulk of the energy resides in non-thermal protons is consistent with the majority, if not all, of the observations. It is suggested that the bulk of the energy in the impulsive phase is initially transferred to 102 - 103keV protons. Acceleration by a series of small shocks is an energy transfer mechanism which gives particles increments in velocity rather than energy and would naturally favour protons over electrons. An important consequence of this result is that the hard X-ray burst must be thermal.

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