Calculation of the energetic neutral atom flux from a 3D time-dependent model heliosphere

Details Calculation of the energetic neutral atom flux from a 3D time-dependent model heliosphere Calculation of the energetic neutral atom flux from a 3D time-dependent model heliosphere

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...477..365s&link_type=abstract

Astronomy and Astrophysics, Volume 477, Issue 2, January II 2008, pp.365-371

Astronomy and Astrophysics

Astrophysics

15

Atomic Processes, Sun: Solar Wind, Sun: Activity, Ism: Atoms

Scientific paper

With the Interstellar Boundary Explorer (IBEX) the measurement of energetic neutral atoms (ENAs) will enable
a remote sensing of the heliospheric boundary region where the solar wind plasma flow meets the interstellar
medium. Together with Voyager 1 (& 2) in (and at least near) the healiosheath there will be a very
fortunate instrument configuration in space that will allow us to obtain valuable information about the
large-scale structure and dynamics of the heliosphere.
Following ongoing theoretical discussions we have computed all-sky maps of the differential flux of ENAs
produced from charge exchange with solar wind protons in a three-dimensionally structured and
time-varying heliosheath.
We employ a three-dimensional, time-dependent hydrodynamic model heliosphere to compute the
production of ENAs by a generalisation of previous two-dimensional approaches.
We find three-dimensionally structured all-sky ENA flux maps that are time-varying due to the solar activity
cycle.
While the study adds to the complexity of the task to correctly interpret the forthcoming
measurements to be made with IBEX, it underlines the potential of this mission to
significantly increase our understanding of the structure and dynamics of the heliosphere.

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