High latitude observations of corotating interaction regions: Remote sensing using energetic particles

Details High latitude observations of corotating interaction regions: Remote sensing using energetic particles High latitude observations of corotating interaction regions: Remote sensing using energetic particles

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..242r&link_type=abstract

ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V

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3

Corotating Streams, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays

Scientific paper

Ulysses observations revealed a strong diminution of 26-day-recurrent energetic ion and electron increases as its latitude increased above 20°. There was a systematic several day lag of the 38-53 keV electron peak intensity behind that of the 480-966 MeV protons. The recurrences persisted to the highest latitudes ~80° in both the southern and northern polar passes, well above the most poleward in situ detection of corotating interaction regions (CIRs) in the solar wind. These effects have been explained in terms of remote magnetic connection from Ulysses to the reverse shock forming the poleward boundary of the CIR. We present theoretical arguments that the dominant mechanism in producing the velocity ordering of the particle intensities is energy loss as the particles propagate from the CIR inward towards the spacecraft. The velocity ordering (regardless of species) follows immediately from the striking result that the energy loss process depends only upon particle velocity (and not on mass or charge) in the limit of very weak scattering. .

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