Collective plasma effects and the electron number problem in solar hard X-ray bursts

Details Collective plasma effects and the electron number problem in solar hard X-ray bursts Collective plasma effects and the electron number problem in solar hard X-ray bursts

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52..117b&link_type=abstract

Solar Physics, vol. 52, Apr. 1977, p. 117-131. Research supported by the Australian National University.

Physics

42

Electron Density (Concentration), Plasma Interactions, Solar Electrons, Solar Wind, Solar X-Rays, Bremsstrahlung, Coulomb Collisions, Dense Plasmas, Density (Number/Volume), Particle Acceleration, Plasma Waves

Scientific paper

Collective interactions with ambient plasma are considered as a source of the electrons producing solar hard X-ray bursts. Models involving thick- and thin-target bremsstrahlung as well as electron confinement in a dense plasma region with continuous in-situ reacceleration are evaluated in a manner consistent with constraints imposed by collective plasma processes. It is shown that the necessary electron injection rate for chromospheric thick-target production of hard X-ray bursts is of the order of the limit imposed by the stability of the reverse current established in the ambient plasma if the acceleration occurs where the ambient density is at least (1 to 5) billion per cu cm. The total number of injected electrons would be 5 by 10 to the (35th to 39th) power and could be supplied by the upflowing plasma in the reverse current. It is found that resonant acceleration might occur in a Langmuir-turbulent dense plasma slab where the flare-enhanced density is sufficient for in-situ hard X-ray emission. In this case, accelerated electrons would be swept out the slab sides as the inflowing plasma releases its energy and would be of the same order as in the thick-target model.

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