Numerical Heliospheric Simulations as Assisting Tool in Interpretation of Multispacecraft Heliospheric Observations.

Details Numerical Heliospheric Simulations as Assisting Tool in Interpretation of Multispacecraft Heliospheric Observations. Numerical Heliospheric Simulations as Assisting Tool in Interpretation of Multispacecraft Heliospheric Observations.

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh23a..03o&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH23A-03

Physics

2101 Coronal Mass Ejections (7513), 2102 Corotating Streams, 2194 Instruments And Techniques, 7959 Models

Scientific paper

Interpretation of multi-spacecraft heliospheric observations and three-dimensional reconstruction of structured and evolving solar wind is difficult. This is especially true for interpretation of white-light structures observed by heliospheric imagers (HI) onboard STEREO spacecraft. Numerical simulations can provide global context and hints what can and cannot be observed. We used the heliospheric code ENLIL and simulated various scenarios of well-defined corotating solar wind streams and ejected transient density structures, and generated synthetic white-light images at various locations. This parametric study illustrates that corotating interaction regions (CIRs) may show as transient structures in HI-2A but not in HI-2B, due to differing Thomson scattering conditions. Further, the same transient density structures may show with different white-light brightness and some can eventually reach the Earth without being detected by the imagers. Finally, we simulate two large limb coronal mass ejections (CMEs), together with additional smaller CMEs, to provide assistance in interpretation of January 24-25 events observed by STEREO/HI and CORIOLIS/SMEI imagers.

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