caa a22 4500 445347090 CHVBK 20180317142832.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11207-011-9858-7 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9858-7 Comparison of Observations at ACE and Ulysses with Enlil Model Results: Stream Interaction Regions During Carrington Rotations 2016 - 2018 [Elektronische Daten] [L. Jian, C. Russell, J. Luhmann, P. MacNeice, D. Odstrcil, P. Riley, J. Linker, R. Skoug, J. Steinberg] During the latitudinal alignment in 2004, ACE and Ulysses encountered two stream interaction regions (SIRs) each Carrington rotation from 2016 to 2018, at 1 and 5.4 AU, respectively. More SIR-driven shocks were observed at 5.4 AU than at 1AU. Three small SIRs at 1AU merged to form a strong SIR at 5.4 AU. We compare the Enlil model results with spacecraft observations from four aspects: i) the accuracy of the latest versions of models (WSA v2.2 and Enlil v2.7) vs. old versions (WSA v1.6 and Enlil v2.6), ii) the sensitivity to different solar magnetograms (MWO vs. NSO), iii) the sensitivity to different coronal models (WSA vs. MAS), iv) the predictive capability at 1AU vs. 5.4 AU. We find the models can capture field sector boundaries with some time offset. Although the new versions have improved the SIR timing prediction, the time offset can be up to two days at 1AU and four days at 5.4 AU. The models cannot capture some small-scale structures, including shocks and small SIRs at 1AU. For SIRs, the temperature and total pressure are often underestimated, while the density compression is overestimated. For slow wind, the density is usually overestimated, while the temperature, magnetic field, and total pressure are often underestimated. The new versions have improved the prediction of the speed and density, but they need more robust scaling factors for magnetic field. The Enlil model results are very sensitive to different solar magnetograms and coronal models. It is hard to determine which magnetogram-coronal model combination is superior to others. Higher-resolution solar and coronal observations, a mission closer to the Sun, together with simulations of greater resolution and added physics, are ways to make progress for the solar wind modeling. Springer Science+Business Media B.V., 2011 Coronal model nationallicence Corotating interaction region nationallicence Heliospheric model nationallicence Radial evolution nationallicence Solar wind nationallicence Space weather nationallicence Jian L. Institute of Geophysics and Planetary Physics, University of California, 90095, Los Angeles, CA, USA aut Russell C. Institute of Geophysics and Planetary Physics, University of California, 90095, Los Angeles, CA, USA aut Luhmann J. Space Sciences Laboratory, University of California, 94720, Berkeley, CA, USA aut MacNeice P. Goddard Space Flight Center, NASA, Code 674, 20771, Greenbelt, MD, USA aut Odstrcil D. Goddard Space Flight Center, NASA, Code 674, 20771, Greenbelt, MD, USA aut Riley P. Predictive Science, Inc., 92121, San Diego, CA, USA aut Linker J. Predictive Science, Inc., 92121, San Diego, CA, USA aut Skoug R. Space Science and Applications, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA aut Steinberg J. Space Science and Applications, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA aut Solar Physics Springer Netherlands 273/1(2011-10-01), 179-203 0038-0938 273:1<179 2011 273 11207 https://doi.org/10.1007/s11207-011-9858-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9858-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jian L. Institute of Geophysics and Planetary Physics, University of California, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Russell C. Institute of Geophysics and Planetary Physics, University of California, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Luhmann J. Space Sciences Laboratory, University of California, 94720, Berkeley, CA, USA aut NATIONALLICENCE 700 1- MacNeice P. Goddard Space Flight Center, NASA, Code 674, 20771, Greenbelt, MD, USA aut NATIONALLICENCE 700 1- Odstrcil D. Goddard Space Flight Center, NASA, Code 674, 20771, Greenbelt, MD, USA aut NATIONALLICENCE 700 1- Riley P. Predictive Science, Inc., 92121, San Diego, CA, USA aut NATIONALLICENCE 700 1- Linker J. Predictive Science, Inc., 92121, San Diego, CA, USA aut NATIONALLICENCE 700 1- Skoug R. Space Science and Applications, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA aut NATIONALLICENCE 700 1- Steinberg J. Space Science and Applications, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 273/1(2011-10-01), 179-203 0038-0938 273:1<179 2011 273 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer