EDP Sciences
Free Access
Volume 401, Number 1, April I 2003
Page(s) L1 - L4
Section Letters
DOI https://doi.org/10.1051/0004-6361:20030238

A&A 401, L1-L4 (2003)
DOI: 10.1051/0004-6361:20030238


Energetic particles from the outer heliosphere appearing as a secondary pick-up ion component

S. V. Chalov1 and H. J. Fahr2

1  Institute for Problems in Mechanics of the Russian Academy of Sciences, Prospect Vernadskogo 101-1, 119526 Moscow, Russia
2  Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
    e-mail: hfahr@astro.uni-bonn.de

(Received 17 December 2002 / Accepted 19 February 2003)

In measured pick-up ion spectra a special spectral feature has been identified on the high side of the pick-up ion injection energy which cannot be explained as due to energy diffusion of primary pick-up protons originating from ionized interstellar H-atoms. As we can show, however, in the following article, this feature can be explained as a secondary pick-up ion feature due to ions originating from the charge exchange ionization of energetic neutral H-atoms entering the inner heliosphere and coming from their birth places in the heliosheath. It may thus be the case that energetic neutral H-atoms from the heliosheath region, searched for by experimenters for quite some time now, have already been seen as secondary pick-up ions in special features of measured distribution functions.

Key words: acceleration of particles -- solar wind -- interplanetary medium

Offprint request: S. V. Chalov, chalov@ipmnet.ru

© ESO 2003