Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh21a1495t&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH21A-1495
Physics
[2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2162] Interplanetary Physics / Solar Cycle Variations, [2164] Interplanetary Physics / Solar Wind Plasma
Scientific paper
The two Voyager missions have demonstrated the highly time-dependent nature of the outer heliosphere, and the measurements from IBEX will require, for proper interpretation of the data, theoretical models that incorporate this time-dependence. Our research group uses multifluid HD models of the global heliosphere with idealized, simplified solar wind conditions for the inner boundary of the simulations. For this contribution, solar wind data of the past four solar cycles, taken from NASA's OMNI data set, is used to build a realistic inner boundary data set for our simulations. This data set is time-dependent so as to realistically represent changes in solar wind characteristics through the solar cycle and capture the corresponding transient effects in the heliosphere. We have had preliminary success with our data set, extrapolating OMNI data, which is entirely Sun-Earth directed, to fill the entire ecliptic disc. The success of the results confirmed to us that, with some improvements, our central technique would create a solar win data set sufficiently realistic for heliospheric simulations. To refine the data set, independent analyses and categorization of data will be performed. Four solar wind regimes are envisioned, undisturbed fast and slow wind, ICME wind, and 'other' wind, the catchall category. After we have categorized the entire OMNI data set, our extrapolations will represent the behavior of each regime in a more realistic fashion. Preliminary results for global heliospheric simulations will be presented.
Heiderer A.
Mueller Holger
Thatcher L. J.
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