Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-02-20
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted by ApJL
Scientific paper
10.1088/0004-637X/694/1/L79
We present an alternate interpretation of recent STEREO/STE observations that were originally attributed to energetic neutral atoms (ENA) from the heliosheath. The signal attributed to the diffuse ENA source instead shows the characteristics of a point source. We point out that the peak intensity seen by STEREO/STE is centered at the ecliptic longitude of the bright X-ray source Sco X-1. The observed energy spectrum and intensity are also consistent with the X-rays from Sco X-1. The problem of energy dissipation at the solar wind termination shock remains unsolved while current understanding of the interaction between the solar wind and interstellar wind awaits future observations.
Frisch Priscilla C.
Giacalone Joe
Hsieh K. C.
Jokipii Randy J.
Kota József
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