Distribution of Energetic Neutral Hydrogen Atoms as Observed with SOHO/CELIAS

M. Hilchenbach, K.C. Hsieh, H. Grünwaldt, F.M. Ipavich, F. Gliem, P. Bochsler, B. Klecker, D. Hovestadt, and the CELIAS TEAM

Paper presented at the IAGA 97, August 4-15, 1997, Uppsala, Sweden.

The time-of-flight mass spectrometer HSTOF of the CELIAS experiment on SOHO has the capability of detecting energetic neutral hydrogen atoms (ENHAs) between 50 and 80keV. We shall report on the ENHA flux limits and apex-antiapex distribution derived from the data collected since launch. The implications of this observations on the existing models of energetic neutral atom (ENA) production in the heliosphere are discussed, i.e. the ENHA distribution resulting from the anomalous cosmic ray (ACR) protons transcharging on the LISM neutral atoms.

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Last Update: February 28, 1997, Peter Wurz