@article{KramerNoackBaumetal.2015, author = {Kramer, Tobias and Noack, Matthias and Baum, Daniel and Hege, Hans-Christian and Heller, Eric J.}, title = {Homogeneous dust emission and jet structure near active cometary nuclei: the case of 67P/Churyumov-Gerasimenko}, arxiv = {http://arxiv.org/abs/1505.08041}, year = {2015}, abstract = {We compute trajectories of dust grains starting from a homogeneous surface activity-profile on a irregularly shaped cometary nucleus. Despite the initially homogeneous dust distribution a collimation in jet-like structures becomes visible. The fine structure is caused by concave topographical features with similar bundles of normal vectors. The model incorporates accurately determined gravitational forces, rotation of the nucleus, and gas-dust interaction. Jet-like dust structures are obtained for a wide range of gas-dust interactions. For the comet 67P/Churyumov-Gerasimenko, we derive the global dust distribution around the nucleus and find several areas of agreement between the homogeneous dust emission model and the Rosetta observation of dust jets, including velocity-dependent bending of trajectories.}, language = {en} } @inproceedings{AllenDramlitschGoodaleetal.2001, author = {Allen, Gabrielle and Dramlitsch, Thomas and Goodale, Tom and Lanfermann, Gerd and Radke, Thomas and Seidel, Edward and Kielmann, Thilo and Verstoep, Kees and Balaton, Zolt{\´a}n and Kacsuk, P{\´e}ter and Szalai, Ferenc and Gehring, J{\"o}rn and Keller, Axel and Streit, Achim and Matyska, Ludek and Ruda, Miroslav and Krenek, Ales and Knipp, Harald and Merzky, Andr{\´e} and Reinefeld, Alexander and Schintke, Florian and Ludwiczak, Bogdan and Nabrzyski, Jarek and Pukacki, Juliusz and Kersken, Hans-Peter and Aloisio, Giovanni and Cafaro, Massimo and Ziegler, Wolfgang and Russell, Michael}, title = {Early experiences with the EGrid testbed}, booktitle = {Proceedings First IEEE/ACM International Symposium on Cluster Computing and the Grid}, doi = {10.1109/CCGRID.2001.923185}, pages = {130 -- 137}, year = {2001}, language = {en} } @article{KramerNoackBaumetal.2018, author = {Kramer, Tobias and Noack, Matthias and Baum, Daniel and Hege, Hans-Christian and Heller, Eric J.}, title = {Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov-Gerasimenko}, volume = {3}, journal = {Advances in Physics: X}, number = {1}, doi = {10.1080/23746149.2017.1404436}, pages = {1404436}, year = {2018}, abstract = {Comets display with decreasing solar distance an increased emission of gas and dust particles, leading to the formation of the coma and tail. Spacecraft missions provide insight in the temporal and spatial variations of the dust and gas sources located on the cometary nucleus. For the case of comet 67P/Churyumov-Gerasimenko (67P/C-G), the long-term obser- vations from the Rosetta mission point to a homogeneous dust emission across the entire illuminated surface. Despite the homogeneous initial dis- tribution, a collimation in jet-like structures becomes visible. We propose that this observation is linked directly to the complex shape of the nucleus and projects concave topographical features into the dust coma. To test this hypothesis, we put forward a gas-dust description of 67P/C-G, where gravitational and gas forces are accurately determined from the surface mesh and the rotation of the nucleus is fully incorporated. The emerging jet-like structures persist for a wide range of gas-dust interactions and show a dust velocity dependent bending.}, language = {en} } @article{AllenDavisGoodaleetal.2005, author = {Allen, Gabrielle and Davis, K. and Goodale, Tom and Hutanu, Andrei and Kaiser, Hartmut and Kielmann, Thilo and Merzky, Andre and Nieuwpoort, R. and Reinefeld, Alexander and Schintke, Florian and Sch{\"u}tt, Thorsten and Seidel, Edward and Ullmer, Brygg}, title = {The Grid Application Toolkit: Toward Generic and Easy Appliction Programming Interfaces for the Grid}, volume = {93}, journal = {Procceedings of the IEEE}, number = {3}, publisher = {IEEE Computer Society Press}, doi = {10.1109/JPROC.2004.842755}, pages = {534 -- 550}, year = {2005}, language = {en} } @inproceedings{SchuettMerzkyHutanuetal.2004, author = {Sch{\"u}tt, Thorsten and Merzky, Andr{\´e} and Hutanu, Andrei and Schintke, Florian}, title = {Remote partial file access using compact pattern descriptions}, booktitle = {4th IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGrid 2004), April 19-22, 2004, Chicago, Illinois, USA}, publisher = {IEEE Computer Society}, doi = {10.1109/CCGrid.2004.1336604}, pages = {482 -- 489}, year = {2004}, language = {en} } @article{ZieglerOgurreckSteinkeetal.2010, author = {Ziegler, Alexander and Ogurreck, Malte and Steinke, Thomas and Beckmann, Felix and Prohaska, Steffen and Ziegler, Andreas}, title = {Opportunities and challenges for digital morphology}, volume = {5}, journal = {Biology Direct}, number = {1}, doi = {10.1186/1745-6150-5-45}, pages = {45}, year = {2010}, language = {en} } @misc{KramerNoackBaumetal.2017, author = {Kramer, Tobias and Noack, Matthias and Baum, Daniel and Hege, Hans-Christian and Heller, Eric J.}, title = {Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov-Gerasimenko}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-66338}, year = {2017}, abstract = {Comets display with decreasing solar distance an increased emission of gas and dust particles, leading to the formation of the coma and tail. Spacecraft missions provide insight in the temporal and spatial variations of the dust and gas sources located on the cometary nucleus. For the case of comet 67P/Churyumov-Gerasimenko (67P/C-G), the long-term obser- vations from the Rosetta mission point to a homogeneous dust emission across the entire illuminated surface. Despite the homogeneous initial dis- tribution, a collimation in jet-like structures becomes visible. We propose that this observation is linked directly to the complex shape of the nucleus and projects concave topographical features into the dust coma. To test this hypothesis, we put forward a gas-dust description of 67P/C-G, where gravitational and gas forces are accurately determined from the surface mesh and the rotation of the nucleus is fully incorporated. The emerging jet-like structures persist for a wide range of gas-dust interactions and show a dust velocity dependent bending.}, language = {en} }