Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.271g&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 271-275 (SEE N87
Physics
3
Halley'S Comet, Ion Density (Concentration), Ion Distribution, Particle Acceleration, Stochastic Processes, Fokker-Planck Equation, Ion Temperature, Particle Flux Density, Solar Wind, Vega Project
Scientific paper
Energetic cometary ion fluxes measured between 2.5×106km and 106km from the cometary nucleus along the inbound trajectory of s/c VEGA-1 are used to derive temperatures of the ion distributions in the solar wind frame. The increase of the temperature is modelled by the temperature change derived from a Fokker-Planck type equation with a source term and a stochastic Fermi acceleration term. The temperature increase predicted by theory is ≈7 keV, considerably higher than the observed one (≈1.5 keV). The second order Fermi mechanism is shown to be capable of explaining the temperature increase, however, it is not yet clear whether the experimental uncertainties can account for the defect of the observed temperature or an as yet unidentified cooling mechanism is at work.
Erdoes G.
Eroshenko E. G.
Gribov B. E.
Gringauz K. I.
Kecskemety Károly
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