Physics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..m708h&link_type=abstract
American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #M7.08
Physics
Scientific paper
The detection of energetic hydrogen atoms (EHAs) between 55 and 80 keV by the time-of-flight mass spectrometer HSTOF of the CELIAS experiment on SOHO near the Lagrangian point L1 has been reported. The EHA flux observed under quiet solar and interplanetary conditions is anisotropic and peaked in the anti-apex direction of the heliosphere. This observation is consistent with models of energetic neutral atom (ENA) production from the anomalous cosmic-ray (ACR) protons transcharging on the neutral atoms of the local interstellar medium. An attempt is made to extend the observation beyond 80 keV to have a better view of the EHA energy spectrum. The detection of heliospheric ENAs can provide an independent means to study solar modulation and shock acceleration of charged particles in and out of the heliosphere.
Bochsler Peter
Gruenwaldt H.
Hilchenbach Martin
Hovestadt Dieter
Hsieh K. C.
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