Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh11b1917z&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH11B-1917
Physics
[2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2151] Interplanetary Physics / Neutral Particles
Scientific paper
Accurate and efficient modeling of the interactions between the solar wind (SW) and local interstellar medium (LISM) based on the creation and loss of hydrogen energetic neutral atoms (ENAs) is essential for understanding NASA's IBEX observations. I have developed a numerical code that determines gains and losses of hydrogen ENAs from 1 AU to the heliopause, and am currently working on including time-dependent SW and the IBEX ribbon. The code takes data from advanced 3D simulations of the SW-LISM interaction, and performs a post-processing analysis to determine the rates of charge-exchange between interstellar hydrogen and energetic protons to compute the flux of ENAs generated at all points in the heliosphere. Once created in the distant regions of the heliosphere, ENAs suffer losses as they propagate to the inner heliosphere. This includes effects of photo-ionization, charge-exchange, and electron-impact ionization. Additional effects, solar gravity and radiation pressure, alter the ENA's trajectory. By directly calculating gains and losses of hydrogen ENAs along lines of sight, an accurate, global picture of hydrogen ENA fluxes at 1 AU as predicted by 3D simulation can be computed in a short time using modest computational resources. Maps of ENA flux computed using my code will be presented, covering an energy range of 0.01 to 6.0 keV, along with maps showing ENA spectral slopes over various lines of sight. My results will also be compared to simulated ENA maps from a fundamentally different ENA model. A brief overview of the code and an interpretation of the results will also be provided.
Heerikhuisen Jacob
Pogorelov Nikolai V.
Zirnstein E. J.
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