Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock

A. Czechowski, H. Fichtner, S. Grzedzielski, M. Hilchenbach, K. C. Hsieh, J. Randy Jokipii, T. Kausch, J. Kota, A. Shaw

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Some characteristics of the neutral hydrogen flux of 55-80 keV detected by CELIAS/HSTOF on board SOHO (in particular, the intensity peaks during the periods when the instrument was directed towards the anti-apex of the local interstellar medium) suggest that the observed atoms may be created in the distant heliosphere, beyond the termination shock, from the anomalous cosmic ray protons which become neutralized by charge-exchange with the background gas. The theoretical models on which this conclusion was first based were very simple and missed some important features. Here we report about the first study of transport of low energy anomalous cosmic rays beyond the solar-wind termination shock employing a model of the heliosphere treating self-consistently the flows of plasma and neutral atoms and including the pressure of cosmic rays. The energetic neutral-atom (ENA) flux created by charge-exchange is calculated and compared with the observations of CELIAS/HSTOF. The viability of using ENAs as a means of imaging the structure of the termination shock, the distant heliosphere and the very local interstellar medium is discussed. We also include some results which may be interesting in connection to possible observations by INCA/Cassini and HENA/IMAGE.

Original languageEnglish (US)
Pages (from-to)622-634
Number of pages13
JournalAstronomy and Astrophysics
Volume368
Issue number2
StatePublished - Mar 2001
Externally publishedYes

Fingerprint

heliosphere
cosmic ray
cosmic rays
energetics
shock
neutral atoms
charge exchange
viability
solar wind
atoms
apexes
hydrogen
plasma
protons
gases
gas
energy

Keywords

  • Cosmic rays
  • Interstellar medium
  • Solar wind

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Czechowski, A., Fichtner, H., Grzedzielski, S., Hilchenbach, M., Hsieh, K. C., Jokipii, J. R., ... Shaw, A. (2001). Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock. Astronomy and Astrophysics, 368(2), 622-634.

Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock. / Czechowski, A.; Fichtner, H.; Grzedzielski, S.; Hilchenbach, M.; Hsieh, K. C.; Jokipii, J. Randy; Kausch, T.; Kota, J.; Shaw, A.

In: Astronomy and Astrophysics, Vol. 368, No. 2, 03.2001, p. 622-634.

Research output: Contribution to journalArticle

Czechowski, A, Fichtner, H, Grzedzielski, S, Hilchenbach, M, Hsieh, KC, Jokipii, JR, Kausch, T, Kota, J & Shaw, A 2001, 'Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock', Astronomy and Astrophysics, vol. 368, no. 2, pp. 622-634.
Czechowski A, Fichtner H, Grzedzielski S, Hilchenbach M, Hsieh KC, Jokipii JR et al. Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock. Astronomy and Astrophysics. 2001 Mar;368(2):622-634.
Czechowski, A. ; Fichtner, H. ; Grzedzielski, S. ; Hilchenbach, M. ; Hsieh, K. C. ; Jokipii, J. Randy ; Kausch, T. ; Kota, J. ; Shaw, A. / Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock. In: Astronomy and Astrophysics. 2001 ; Vol. 368, No. 2. pp. 622-634.
@article{f6c532e4232c442d8864fc4992f7b402,
title = "Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock",
abstract = "Some characteristics of the neutral hydrogen flux of 55-80 keV detected by CELIAS/HSTOF on board SOHO (in particular, the intensity peaks during the periods when the instrument was directed towards the anti-apex of the local interstellar medium) suggest that the observed atoms may be created in the distant heliosphere, beyond the termination shock, from the anomalous cosmic ray protons which become neutralized by charge-exchange with the background gas. The theoretical models on which this conclusion was first based were very simple and missed some important features. Here we report about the first study of transport of low energy anomalous cosmic rays beyond the solar-wind termination shock employing a model of the heliosphere treating self-consistently the flows of plasma and neutral atoms and including the pressure of cosmic rays. The energetic neutral-atom (ENA) flux created by charge-exchange is calculated and compared with the observations of CELIAS/HSTOF. The viability of using ENAs as a means of imaging the structure of the termination shock, the distant heliosphere and the very local interstellar medium is discussed. We also include some results which may be interesting in connection to possible observations by INCA/Cassini and HENA/IMAGE.",
keywords = "Cosmic rays, Interstellar medium, Solar wind",
author = "A. Czechowski and H. Fichtner and S. Grzedzielski and M. Hilchenbach and Hsieh, {K. C.} and Jokipii, {J. Randy} and T. Kausch and J. Kota and A. Shaw",
year = "2001",
month = "3",
language = "English (US)",
volume = "368",
pages = "622--634",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
number = "2",

}

TY - JOUR

T1 - Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock

AU - Czechowski, A.

AU - Fichtner, H.

AU - Grzedzielski, S.

AU - Hilchenbach, M.

AU - Hsieh, K. C.

AU - Jokipii, J. Randy

AU - Kausch, T.

AU - Kota, J.

AU - Shaw, A.

PY - 2001/3

Y1 - 2001/3

N2 - Some characteristics of the neutral hydrogen flux of 55-80 keV detected by CELIAS/HSTOF on board SOHO (in particular, the intensity peaks during the periods when the instrument was directed towards the anti-apex of the local interstellar medium) suggest that the observed atoms may be created in the distant heliosphere, beyond the termination shock, from the anomalous cosmic ray protons which become neutralized by charge-exchange with the background gas. The theoretical models on which this conclusion was first based were very simple and missed some important features. Here we report about the first study of transport of low energy anomalous cosmic rays beyond the solar-wind termination shock employing a model of the heliosphere treating self-consistently the flows of plasma and neutral atoms and including the pressure of cosmic rays. The energetic neutral-atom (ENA) flux created by charge-exchange is calculated and compared with the observations of CELIAS/HSTOF. The viability of using ENAs as a means of imaging the structure of the termination shock, the distant heliosphere and the very local interstellar medium is discussed. We also include some results which may be interesting in connection to possible observations by INCA/Cassini and HENA/IMAGE.

AB - Some characteristics of the neutral hydrogen flux of 55-80 keV detected by CELIAS/HSTOF on board SOHO (in particular, the intensity peaks during the periods when the instrument was directed towards the anti-apex of the local interstellar medium) suggest that the observed atoms may be created in the distant heliosphere, beyond the termination shock, from the anomalous cosmic ray protons which become neutralized by charge-exchange with the background gas. The theoretical models on which this conclusion was first based were very simple and missed some important features. Here we report about the first study of transport of low energy anomalous cosmic rays beyond the solar-wind termination shock employing a model of the heliosphere treating self-consistently the flows of plasma and neutral atoms and including the pressure of cosmic rays. The energetic neutral-atom (ENA) flux created by charge-exchange is calculated and compared with the observations of CELIAS/HSTOF. The viability of using ENAs as a means of imaging the structure of the termination shock, the distant heliosphere and the very local interstellar medium is discussed. We also include some results which may be interesting in connection to possible observations by INCA/Cassini and HENA/IMAGE.

KW - Cosmic rays

KW - Interstellar medium

KW - Solar wind

UR - http://www.scopus.com/inward/record.url?scp=0035264297&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035264297&partnerID=8YFLogxK

M3 - Article

VL - 368

SP - 622

EP - 634

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 2

ER -