Latitudinal and Radial Gradients of Galactic Cosmic Ray Protons and Electrons in the Inner Heliosphere - Pamela and Ulysses Observations

Details Latitudinal and Radial Gradients of Galactic Cosmic Ray Protons and Electrons in the Inner Heliosphere - Pamela and Ulysses Observations Latitudinal and Radial Gradients of Galactic Cosmic Ray Protons and Electrons in the Inner Heliosphere - Pamela and Ulysses Observations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51b1673g&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51B-1673

Astronomy and Astrophysics

Astrophysics

[7500] Solar Physics, Astrophysics, And Astronomy

Scientific paper

The PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) space borne experiment was launched on the 15th of June 2006 and is continuously collecting data since then. The apparatus measures electrons, positrons, protons, anti-protons and heavier nuclei from about 100 MeV to several hundreds of GeV. Ulysses, launched on the 6th of October 1990, was placed in an elliptical, high inclined (80.2 degree) orbit around the Sun, and was finally switched off in June 2009. It has been the only spacecraft exploring high-latitude regions of the inner heliosphere. The Kiel Electron Telescope (KET) aboard Ulysses measures electrons from 3 MeV to a few GeV and protons as well as helium in the energy range from 6 MeV/nucleon to above 2 GeV/nucleon. Due to the spacecraft's trajectory, the measurements reflect not only the temporal variations but also the spatial distribution. In order to determine the radial and latitudinal gradients of galactic cosmic rays protons and electrons in the inner heliosphere, we use the PAMELA measurements close to Earth, which reflect their temporal variation. In this contribution we focus on the 23rd solar minimum and report the corresponding gradients for protons of about 1.5 GeV and for electrons of about 1.2 GeV.

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