Exploring the time dispersion of the IBEX-HI energetic neutral atom spectra at the ecliptic poles

F. Allegrini, M. Bzowski, M. A. Dayeh, R. Demajistre, M. I. Desai, H. O. Funsten, S. A. Fuselier, P. H. Janzen, M. A. Kubiak, D. J. McComas, D. B. Reisenfeld, N. Schwadron, R. Vanderspek

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

The Interstellar Boundary Explorer (IBEX) has observed energetic neutral atom (ENA) hydrogen emissions from the edge of the solar system for more than three years. The observations span energies from 0.01 to 6keV FWHM. At energies greater than 0.5-6keV, and for a travel distance of 100AU, the travel time difference between the slowest and the fastest ENA is more than a year. Therefore, we construct spectra including the effect that slower ENAs left the source at an earlier time than faster ones. If the source produces a steady rate of ENAs and the extinction does not vary, then we expect that the spectral shape would be time independent. However, while the extinction of ENAs has been fairly constant during the first two and a half years, the source appears to have changed, and thus the spectra at a single time may not represent the conditions at the source. IBEX's viewing allows continuous sampling of the ecliptic poles where fluxes can be continuously monitored. For a given source distance we construct spectra assuming that the measured ENAs left the source at roughly the same time. To accomplish this construction, we apply time lag corrections to the signal at different ENA energies that take into account the travel time difference. We show that the spectral shape at the poles exhibits a statistically significant change with time.

Original languageEnglish (US)
Article numberL41
JournalAstrophysical Journal Letters
Volume749
Issue number2
DOIs
StatePublished - Apr 20 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: heliosphere

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    Allegrini, F., Bzowski, M., Dayeh, M. A., Demajistre, R., Desai, M. I., Funsten, H. O., Fuselier, S. A., Janzen, P. H., Kubiak, M. A., McComas, D. J., Reisenfeld, D. B., Schwadron, N., & Vanderspek, R. (2012). Exploring the time dispersion of the IBEX-HI energetic neutral atom spectra at the ecliptic poles. Astrophysical Journal Letters, 749(2), [L41]. https://doi.org/10.1088/2041-8205/749/2/L41