Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh31b..01m&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH31B-01
Physics
2126 Heliosphere/Interstellar Medium Interactions, 2144 Interstellar Gas, 2151 Neutral Particles (7837), 2194 Instruments And Techniques
Scientific paper
Due to the Sun's motion relative to the surrounding interstellar medium, an interstellar wind of neutral gas blows through the heliosphere. Close to the Sun it is deflected by gravitation and diluted by ionization. Every year in fall and spring the Interstellar Boundary Explorer (IBEX) will observe directly this neutral gas flow at 1 AU over periods of several months. The IBEX-Lo sensor employs a powerful triple time-of-flight mass spectrometer and can image the O and He flow in the fall and spring. This combination of two key interstellar species will facilitate a direct comparison of the pristine interstellar flow of He, which has not been altered in the heliospheric boundary region, with O, which consists of a depleted pristine component as well as decelerated and heated neutrals processed in the outer heliosheath. Extracting the latter so-called secondary component of interstellar neutrals will provide quantitative constraints for several important parameters of the heliosheath interaction in current global heliospheric models. Finding the fraction and width of the secondary component yields an independent value for the global filtration factor of species, such as O and H, which can only be inferred, barring observations in the local interstellar cloud proper. The direction of the secondary component will also provide independent information on the interstellar magnetic field strength and orientation, which has been inferred from SOHO SWAN Ly-Alpha backscattering observations and the two Voyager crossings of the termination shock. We will discuss the planned measurement sequence and present predicted interstellar gas flow observations with IBEX-Lo, based on instrument calibrations and heliospheric models.
Alexashov Dimitry
Bzowski Maciej
Fuselier Stephen
Izmodenov Vladislav V.
Kucharek Harald
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