Steady-state event-excluded proton spectra at solar minimum at all heliolatitudes

Details Steady-state event-excluded proton spectra at solar minimum at all heliolatitudes Steady-state event-excluded proton spectra at solar minimum at all heliolatitudes

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30uly11p&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 19, pp. ULY 11-1, CiteID 8037, DOI 10.1029/2003GL017154

Physics

2

Interplanetary Physics: Energetic Particles, Heliospheric (7514), Solar, Interplanetary Physics: Solar Cycle Variations (7536)

Scientific paper

We present spectra of a steady foreground population of particles in the inner heliosphere observed by the Heliosphere Instrument for Spectra, Composition, and Anisotopy at Low Energies (HISCALE) on board the Ulysses spacecraft. The observed spectra come from the full range of heliolatitudes visited by Ulysses, -80 to +80 degrees, during Ulysses' first full orbit of the Sun during solar minimum. New corrections for background were applied resulting in a more sensitive and higher energy resolution data set that we used here to analyze quiet-time (event-excluded) spectra. We found a persistent foreground population of energetic protons that permeate the inner heliosphere. These protons have complex energy spectra suggesting multiple acceleration sources, and these particles move predominently in non-radial directions. These findings support the idea that the inner heliosphere acts as a reservoir for energetic protons.

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