Authors:
Hilchenbach M., Hsieh K.C., Hovestadt D.,
Klecker B., Grüwaldt H., Bochsler P., Ipavich F.M., Bürgi A.,
Möbius E., Gliem F., Axford W.I., Balsiger H., Bornemann W.,
Coplan M.A., Galvin A.B., Geiss J., Gloeckler G., Hefti S., Judge D.L.,
Kallenbach R., Laeverenz P., Lee M.A., Livi S., Managadze G.G., Marsch
E., Neugebauer M., Ogawa H.S., Reiche K.-U., Scholer M., Verigin M.I.,
Wilken B., and Wurz P.
Reference: Astrophysical Journal v.503, p.916 1998
Abstract:
The High-Energy Suprathermal Time-of-Flight sensor (HSTOF) of the
Charge, Element, and Isotope Analysis System (CELIAS) on the Solar and
Heliospheric Observatory (SOHO) near the Lagrangian point L1 is capable
of identifying energetic hydrogen atoms (EHAs) between 55 and 80 keV.
Between 1996 February 13 and 1997 August 31, near solar minimum, there
were 285 "quiet" days when the interplanetary charged-particle flux was
low. During these quiet times, HSTOF scanned the apex of the heliosphere
once and the antiapex twice. The flux level and time profile, and hence
the arrival direction, of the EHAs accumulated during these quiet times
are best interpreted as fluxes of EHAs coming from the heliosheath.