We present a new local interstellar spectrum for cosmic ray electrons over an energy range from 1 MeV to 70 GeV. Below (0.8 plus minus 0.2) GeV it has a power law form, E^-(1.55 plus minus 0.05), with E kinetic energy, which is consistent with previous studies. This is derived from comparing Voyager 1 electron data observed during 2010 with a comprehensive modulation model. However, reproducing the PAMELA electron spectrum observed at Earth during late 2006 and to address an unexpected increase in the electron spectrum between about 2 GeV and up to about 20 GeV, a spectral index of -(3.3 plus minus 0.1) instead of the reported -(3.18 plus minus 0.05) was found for this energy range. This feature cannot be caused by solar modulation or any other process inside the heliosphere.
@article{arxiv.1308.1666,
title = {A Very Local Interstellar Spectrum for Galactic Electrons},
author = {M. S. Potgieter and E. E. Vos and R. R. Nndanganeni and M. Boezio and R. Munini},
journal= {arXiv preprint arXiv:1308.1666},
year = {2013}
}
Comments
Proceedings of the 33rd International Cosmic Ray Conference. arXiv admin note: text overlap with arXiv:1308.1591