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Title: IONIZATION IN ATMOSPHERES OF BROWN DWARFS AND EXTRASOLAR PLANETS. IV. THE EFFECT OF COSMIC RAYS

Abstract

Cosmic rays provide an important source for free electrons in Earth's atmosphere and also in dense interstellar regions where they produce a prevailing background ionization. We utilize a Monte Carlo cosmic ray transport model for particle energies of 10{sup 6} eV 10{sup -8} when p{sub gas} < 10{sup -8} bar, suggesting that this part of the atmosphere may behave as a weakly ionized plasma. Although cosmic rays enhance the degree of ionization by over three orders of magnitude in the upper atmosphere, the effect is not likely to be significant enough for sustained coupling of the magnetic field to the gas.

Authors:
Publication Date:
OSTI Identifier:
22133903
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 774; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC RADIATION; EARTH ATMOSPHERE; ELECTRONS; IONIZATION; MAGNETIC FIELDS; MONTE CARLO METHOD; PARTICLES; PLANETS; PLASMA; TRANSPORT THEORY

Citation Formats

Rimmer, P. B., and Helling, Ch., E-mail: pr33@st-andrews.ac.uk. IONIZATION IN ATMOSPHERES OF BROWN DWARFS AND EXTRASOLAR PLANETS. IV. THE EFFECT OF COSMIC RAYS. United States: N. p., 2013. Web. doi:10.1088/0004-637X/774/2/108.
Rimmer, P. B., & Helling, Ch., E-mail: pr33@st-andrews.ac.uk. IONIZATION IN ATMOSPHERES OF BROWN DWARFS AND EXTRASOLAR PLANETS. IV. THE EFFECT OF COSMIC RAYS. United States. doi:10.1088/0004-637X/774/2/108.
Rimmer, P. B., and Helling, Ch., E-mail: pr33@st-andrews.ac.uk. Tue . "IONIZATION IN ATMOSPHERES OF BROWN DWARFS AND EXTRASOLAR PLANETS. IV. THE EFFECT OF COSMIC RAYS". United States. doi:10.1088/0004-637X/774/2/108.
@article{osti_22133903,
title = {IONIZATION IN ATMOSPHERES OF BROWN DWARFS AND EXTRASOLAR PLANETS. IV. THE EFFECT OF COSMIC RAYS},
author = {Rimmer, P. B. and Helling, Ch., E-mail: pr33@st-andrews.ac.uk},
abstractNote = {Cosmic rays provide an important source for free electrons in Earth's atmosphere and also in dense interstellar regions where they produce a prevailing background ionization. We utilize a Monte Carlo cosmic ray transport model for particle energies of 10{sup 6} eV 10{sup -8} when p{sub gas} < 10{sup -8} bar, suggesting that this part of the atmosphere may behave as a weakly ionized plasma. Although cosmic rays enhance the degree of ionization by over three orders of magnitude in the upper atmosphere, the effect is not likely to be significant enough for sustained coupling of the magnetic field to the gas.},
doi = {10.1088/0004-637X/774/2/108},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 774,
place = {United States},
year = {2013},
month = {9}
}