Observation of energetic particles (E greater than 30 keV) by the Giotto experiment EPA in the magnetic cavity of Comet Halley

Details Observation of energetic particles (E greater than 30 keV) by the Giotto experiment EPA in the magnetic cavity of Comet Halley Observation of energetic particles (E greater than 30 keV) by the Giotto experiment EPA in the magnetic cavity of Comet Halley

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..145k&link_type=abstract

In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 145-148 (SEE N88-21884 14-91)

Physics

Cavities, Energetic Particles, Giotto Mission, Halley'S Comet, Interplanetary Magnetic Fields, Electrons, Ion Scattering, Plasma Acceleration

Scientific paper

The Energetic Particle Analyzer EPA/EPONA onboard the Giotto S/C detected on 14 March, 1986 in the magnetic cavity of Comet Halley energetic ions with energies greater than 3.5 MeV as well as electrons greater than 300 keV. Between the forward and backward viewing telescopes an anisotropy ratio in the count rates of 2:1 is observed which results from energetic ions since neutral particles should not be detectable. The energetic ions are quasi trapped and can exceed the cavity due to their large gyroradii whereas electrons are more confined inside the contact surface. It is suggested that ions and electrons are accelerated by field line merging processes which seem to be possible at the sunward side of the pile-up region. Fermi acceleration of ions inside the cavity by multiple scattering processes and the entry of energized pick-up ions from the cometosheath region into the cavity must be considered.

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