Latitudinal distribution of greater than 106 MeV protons and its relation to the ambient solar wind in the inner southern and northern heliosphere - ULYSSES Cosmic and Solar Particle Investigation Kiel Electron Telescope results

Details Latitudinal distribution of greater than 106 MeV protons and its relation to the ambient solar wind in the inner southern and northern heliosphere - ULYSSES Cosmic and Solar Particle Investigation Kiel Electron Telescope results Latitudinal distribution of greater than 106 MeV protons and its relation to the ambient solar wind in the inner southern and northern heliosphere - ULYSSES Cosmic and Solar Particle Investigation Kiel Electron Telescope results

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.4809h&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 4809

Other

10

Solar Protons, Solar Wind, Heliosphere, Galactic Cosmic Rays, Ulysses Mission, Southern Hemisphere, Spacecraft Trajectories, Northern Hemisphere

Scientific paper

We present observations and model calculations of the modulated intensities of galactic cosmic ray protons above 106 MeV/n along the Ulysses trajectory. According to standard drift-dominated modulation models, one would expect a radial gradient of about 2 percent/AU and a latitudinal gradient of about 1.2 percent/degree in both hemispheres. The measured mean radial gradient of about 3 percent/AU is within the uncertainties in good agreement with the model predictions. However, the measured mean latitudinal gradient has a value of (0.33 +/- 0.04) percent/degree in both hemispheres at intermediate latitudes and is by a factor of four lower than expected. In the modified models the latitudinal gradient is in agreement with the measured ones when we increase the diffusion coefficient perpendicular to the magnetic field in polar direction to a value of 15 percent of the diffusion coefficient parallel to the magnetic field. At lower latitudes, when Ulysses is embedded in the streamer belt, the models predict approximately the same latitudinal gradient than at intermediate latitudes, whereas the measured ones are significant smaller, or even vanishing. The observations support the previous conclusion from Paizis et al. (1995) that a significant latitudinal gradient is only observed when Ulysses is outside the streamer belt. Another remarkable observation is the difference of the radial gradient Gr at about 3.5 AU in the Southern and in the Northern Hemisphere.

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