You need JavaScript to view this

Detection of /sup 4/He in stratospheric particles gives evidence of extraterrestrial origin

Journal Article:

Abstract

The detection of large concentrations of /sup 4/He in some ..mu..m size stratospheric particles collected during the past 2 years is here reported. The final /sup 4/He concentrations ranged from 0.002 to 0.25 cc/gm. Such high concentrations confirm that the particles were extraterrestrial and that some of them were exposed to solar wind for at least 10 to 100 years; also, since solar wind ions are implanted only to depths of approximately 500 A, the measurements also indicate that the particles existed as small particles in space and were not produced in the atmosphere by fragmentation of larger meteoroids. The possibility that the observed He could have been the product of decaying U appears remote. Since micrometeorites probably have cometary origin, they are potentially a valuable source of primitive Solar System matter.
Authors:
Rajan, R S; [1]  Brownlee, D E; Tomandl, D; Hodge, P W; Farrar, H; Britten, R A
  1. Carnegie Institution of Washington, D.C. (USA). Dept. of Terrestrial Magnetism
Publication Date:
May 12, 1977
Product Type:
Journal Article
Reference Number:
AIX-08-340412; EDB-78-023747
Resource Relation:
Journal Name: Nature (London); (United Kingdom); Journal Volume: 267:5607
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; METEOROIDS; CHEMICAL COMPOSITION; ABUNDANCE; HELIUM 4; MASS SPECTROSCOPY; METEORITES; PARTICLE SIZE; SOLAR WIND; STRATOSPHERE; EARTH ATMOSPHERE; EVEN-EVEN NUCLEI; HELIUM ISOTOPES; ISOTOPES; LIGHT NUCLEI; NUCLEI; SIZE; SOLAR ACTIVITY; SPECTROSCOPY; STABLE ISOTOPES; 640107* - Astrophysics & Cosmology- Planetary Phenomena
OSTI ID:
5442038
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: NATUA
Submitting Site:
INIS
Size:
Pages: 133-134
Announcement Date:

Journal Article:

Citation Formats

Rajan, R S, Brownlee, D E, Tomandl, D, Hodge, P W, Farrar, H, and Britten, R A. Detection of /sup 4/He in stratospheric particles gives evidence of extraterrestrial origin. United Kingdom: N. p., 1977. Web. doi:10.1038/267133a0.
Rajan, R S, Brownlee, D E, Tomandl, D, Hodge, P W, Farrar, H, & Britten, R A. Detection of /sup 4/He in stratospheric particles gives evidence of extraterrestrial origin. United Kingdom. doi:10.1038/267133a0.
Rajan, R S, Brownlee, D E, Tomandl, D, Hodge, P W, Farrar, H, and Britten, R A. 1977. "Detection of /sup 4/He in stratospheric particles gives evidence of extraterrestrial origin." United Kingdom. doi:10.1038/267133a0. https://www.osti.gov/servlets/purl/10.1038/267133a0.
@misc{etde_5442038,
title = {Detection of /sup 4/He in stratospheric particles gives evidence of extraterrestrial origin}
author = {Rajan, R S, Brownlee, D E, Tomandl, D, Hodge, P W, Farrar, H, and Britten, R A}
abstractNote = {The detection of large concentrations of /sup 4/He in some ..mu..m size stratospheric particles collected during the past 2 years is here reported. The final /sup 4/He concentrations ranged from 0.002 to 0.25 cc/gm. Such high concentrations confirm that the particles were extraterrestrial and that some of them were exposed to solar wind for at least 10 to 100 years; also, since solar wind ions are implanted only to depths of approximately 500 A, the measurements also indicate that the particles existed as small particles in space and were not produced in the atmosphere by fragmentation of larger meteoroids. The possibility that the observed He could have been the product of decaying U appears remote. Since micrometeorites probably have cometary origin, they are potentially a valuable source of primitive Solar System matter.}
doi = {10.1038/267133a0}
journal = {Nature (London); (United Kingdom)}
volume = {267:5607}
journal type = {AC}
place = {United Kingdom}
year = {1977}
month = {May}
}