NDLI: Composition of Interstellar Neutrals and the Origin of Anomalous Cosmic Rays

Content Provider	Springer Nature Link
Author	Gloeckler, G. Fisk, L. A. Geiss, J. Hill, M. E. Hamilton, D. C. Decker, R. B. Krimigis, S. M.
Copyright Year	2009
Abstract	Knowledge of the elemental composition of the interstellar gas is of fundamental importance for understanding galactic chemical evolution. In addition to spectroscopic determinations of certain element abundance ratios, measurements of the composition of interstellar pickup ions and Anomalous Cosmic Rays (ACRs) have provided the principal means to obtain this critical information. Recent advances in our understanding of particle acceleration processes in the heliosphere and measurements by the Voyagers of the energy spectra and composition of energetic particles in the heliosheath provide us with another means of determining the abundance of the neutral components of the local interstellar gas. Here we compare the composition at the termination shock of six elements obtained from measurements of (a) pickup ions at ∼5 AU, (b) ACRs in the heliosphere at ∼70 AU, and (c) energetic particles as well as (d) ACRs in the heliosheath at ∼100 AU. We find consistency among these four sets of derived neutral abundances. The average interstellar neutral densities at the termination shock for H, N, O, Ne and Ar are found to be 0.055±0.021 cm$^{−3}$, (1.44±0.45)×10$^{−5}$ cm$^{−3}$, (6.46±1.89)×10$^{−5}$ cm$^{−3}$, (8.5±3.3)×10$^{−6}$ cm$^{−3}$, and (1.08±0.49)×10$^{−7}$ cm$^{−3}$, respectively, assuming the He density is 0.0148±0.002 cm$^{−3}$.
Starting Page	163
Ending Page	175
Page Count	13
File Format	PDF
ISSN	00386308
Journal	Space Science Reviews
Volume Number	143
Issue Number	1-4
e-ISSN	15729672
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-01-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Interstellar medium: elemental composition Anomalous cosmic rays: origin Astrophysics Aerospace Technology and Astronautics Planetology Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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