Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...431.1061c&link_type=abstract
Astronomy and Astrophysics, Volume 431, Issue 3, March I 2005, pp.1061-1068
Astronomy and Astrophysics
Astrophysics
5
Sun: Solar Wind, Shock Waves, Ism: Cosmic Rays, Interplanetary Medium
Scientific paper
We demonstrate the possibility of deriving the anomalous cosmic ray (ACR) spectrum at the solar wind termination shock and the strength of the shock using energetic neutral H and He atoms (ENA) measurements at 1 AU. Assuming that the energetic neutral atoms detected by CELIAS/HSTOF on board SOHO are of ACR origin, we consider χ2 fits to the ACR termination shock spectrum based on approximations to the ACR distribution downstream of the shock. We show that the method becomes much more effective when the low-energy ENA data are combined with the available high-energy ACR data from Voyager spacecraft. The results imply a weak termination shock (compression ratio ˜2.9).
Czechowski Andrzej
Hilchenbach Martin
Hsieh K. C.
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