Probing the heliosphere with energetic hydrogen atoms

K. C. Hsieh, K. L. Shih, J. Randy Jokipii, S. Grzedzielski

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The idea of using energetic neutral atoms (ENAs), produced by charge exhange between energetic ions and ambient neutral atoms, as a diagnostic tool to investigate planetary magnetospheres from a distance has been extended to the investigation of the heliosphere. Here, we explore what one can reasonably expect of the heliospheric ENA (HSENA) and what criteria would be imposed on HSENA instruments by concentrating on 10-103 keV protons in quiet-time interplanetary space, solar-flare events, corotating interaction regions, and anomalous cosmic rays. Simple modeling shows that energetic hydrogen atoms (EHAs) from these proton populations have distinctive signatures and that the detection of these particles can reveal energy, spatial, and temporal distributions of the protons in and out of the ecliptic, thus providing information on the acceleration and propagation of ions in three-dimensional interplanetary space, including the solar-wind termination shock. Such breadth of information could not be gained by in situ means.

Original languageEnglish (US)
Pages (from-to)756-763
Number of pages8
JournalAstrophysical Journal
Volume393
Issue number2
StatePublished - 1992

Fingerprint

heliosphere
neutral atoms
hydrogen atoms
interplanetary space
energetics
hydrogen
protons
planetary magnetospheres
ecliptic
temporal distribution
concentrating
solar flares
solar wind
ion
cosmic rays
energy distribution
spatial distribution
ions
shock
signatures

Keywords

  • Cosmic rays
  • Interplanetary medium
  • Planets and satellites: general
  • Sun: particle emission

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Hsieh, K. C., Shih, K. L., Jokipii, J. R., & Grzedzielski, S. (1992). Probing the heliosphere with energetic hydrogen atoms. Astrophysical Journal, 393(2), 756-763.

Probing the heliosphere with energetic hydrogen atoms. / Hsieh, K. C.; Shih, K. L.; Jokipii, J. Randy; Grzedzielski, S.

In: Astrophysical Journal, Vol. 393, No. 2, 1992, p. 756-763.

Research output: Contribution to journalArticle

Hsieh, KC, Shih, KL, Jokipii, JR & Grzedzielski, S 1992, 'Probing the heliosphere with energetic hydrogen atoms', Astrophysical Journal, vol. 393, no. 2, pp. 756-763.
Hsieh KC, Shih KL, Jokipii JR, Grzedzielski S. Probing the heliosphere with energetic hydrogen atoms. Astrophysical Journal. 1992;393(2):756-763.
Hsieh, K. C. ; Shih, K. L. ; Jokipii, J. Randy ; Grzedzielski, S. / Probing the heliosphere with energetic hydrogen atoms. In: Astrophysical Journal. 1992 ; Vol. 393, No. 2. pp. 756-763.
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