Particle observations by EPA/EPONA during the outbound pass of Giotto from Comet Halley and their relationship to large scale magnetic field irregularities

Details Particle observations by EPA/EPONA during the outbound pass of Giotto from Comet Halley and their relationship to large scale magnetic field irregularities Particle observations by EPA/EPONA during the outbound pass of Giotto from Comet Halley and their relationship to large scale magnetic field irregularities

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..455k&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, July-Aug. 1990, p. 455-462. Research supported by Max-Planck-Gesellschaft zur Foer

Physics

4

Energetic Particles, Giotto Mission, Halley'S Comet, Nonuniform Magnetic Fields, Anisotropy, Bow Waves, Magnetometers, Spike Potentials

Scientific paper

The acceleration processes producing spikes seen superimposed on the general intensity time profile of energetic particles obtained with EPA/EPONA (E/H2O/ greater than 60 keV) during the outbound pass of Giotto on March 14-15, 1986, are studied using complementary magnetic field data. Three different types of spikes were identified. Evidence for the ion pick-up process and probably also for field line reconnection, as well as for the shock drift process combined with the first order Fermi mechanism, was found near to the bowshock. At distances greater than 1 x 10 to the 6th km from the bowshock generally the second order Fermi effect contributed to the observed particle energies. The anisotropy in particle count rate detected during the inbound and outbound passes suggests a preferential escape of particles from the outbound bowshock.

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