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Issue A&A
Volume 410, Number 1, October IV 2003
Page(s) 165 - 173
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20031254



A&A 410, 165-173 (2003)
DOI: 10.1051/0004-6361:20031254

Local interstellar cloud grains outside the heliopause

A. Czechowski1 and I. Mann2

1  Space Research Centre, Polish Academy of Sciences, Bartycka 18A, 00-716 Warsaw, Poland
2  Institut fuer Planetologie, Westfaelische Wilhelms-Universitaet, Wilhelm-Klemm-Str. 10, 48149 Muenster, Germany

(Received 31 January 2003 / Accepted 18 July 2003)

Abstract
The dynamics of small (~0.01 $\mu$m) interstellar grains in the heliospheric transition region is studied using numerical simulations. The velocity distributions of the grains at the boundary of the heliosphere are found to depend sensitively on the global structure of the transition region, in particular on the presence of the heliospheric bow shock, and can be also used to estimate the charge-to-mass ratio of grains. The simulations include the grain impact velocity distributions that could be measured on board an Interstellar Probe spacecraft. Similar dust dynamics is expected around astrospheres.


Key words: ISM: dust, extinction -- ISM: kinematics and dynamics -- magnetic fields -- interplanetary medium -- Sun: solar wind

Offprint request: A. Czechowski, ace@cbk.waw.pl

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