TP4
DR. IOANNIS KOURAKIS
Dr. Ioannis Kourakis from Queens University Belfast, Northern Ireland is a guest of Prof. Dr. Reinhard Schlickeiser and will give a talk on "Rogue Waves in Electromagnetic Beam-Plasma Interactions: modeling and phenomenology" on Wednesday, 26.11.2014 starting at 10:15 am in NB 7/67 as part of the seminar "Space and Astrophysics". Interested parties are welcome to attend!
Abstract: Extreme events in the form of rogue waves (freak waves) occur widely in the open sea. These are space‐and time‐localised excitations, which appear unexpectedly and are characterised by significant amplitude (exceeding 2.5 times the average turbulence level in their environment). Beyond ocean dynamics, the mechanisms underlying rogue wave formation are now being investigated in various physical contexts, including materials science, nonlinear optics and plasma physics , to mention but a few.
Inspired by the ubiquity of this challenging phenomenon, we have undertaken an investigation, from first principles, of the occurrence of rogue waves associated with the propagation of an electromagnetic pulse in a plasma. A multiscale technique is employed to solve the fluid‐Maxwell equations describing a weakly nonlinear circularly polarized electromagnetic pulses in collisional magnetized plasmas. A nonlinear Schrodinger (NLS) type equation is shown to govern the amplitude of the vector potential. A brief review of existing theories based on non‐stationary envelope solutions of the NLS equation is presented (Peregrine soliton, Akhmediev breather, Kuznetzov‐Ma breather), and the variation of their structural properties with the magnetic field is investigated. Recent advances on numerical investigations of the occurrence of rogue waves in plasmas are presented and discussed.
TP4
PROF. DR. YURI LITVINENKO
Prof. Dr. Yuri Litvinenko from the University of Waikato, New Zealand is a guest of Prof. Dr. Reinhard Schlickeiser (TP IV). He will give a talk on "Regular and diffusive photospheric flux cancellation" as part of the seminar "Space and Astrophysics" on Wednesday, 12.11.2014, 10:15 am in NB 7/67. Interested parties are cordially invited!
Abstract: Photospheric flux cancellation on the Sun is considered. Observations imply that cancellation can be a diffusive rather than regular process. A criterion is derived, which quantifies the parameter range in which diffusive photospheric cancellation should occur. Regular cancellation models are shown to give a quantitatively accurate description of photospheric cancellation. Application of the results to large-scale dispersal of the photospheric magnetic flux is discussed.
AEPT
DR. RENATE FÖRCH
Dr. Renate Förch from Fraunhofer ICT-IMM / BioNanoInterfaces, M4N from Mainz will give a lecture on "Active materials for wound healing - approaches and findings from the last two EU projects (EU-Project: Bacterio Safe - Active wound dressing based on biological mimicry & EU-Project: EMBEK1 - Development and analysis of polymer based multifunctional bactericidal materials) on Tuesday, December 2, 2014, 10:00 am in building ID 04/401. Interested parties are cordially invited!
EP2
PROF. DR. ÖMER ILDAY
Prof. Dr. Ömer Ilday from Bilkent University at Ankara, Turkey, will be a guest at RUB from 27-29 October 2014. As part of Turkey Week, he will give a lecture on Bilkent University at Ankara (in English) in cooperation with the Institute of Experimental Physics II at RUB on October 28, 2014, starting at 16:00. This has been held in the International Lounge in the Mensa Building/Bistro Level. Interested parties are cordially invited.
EP2
PROF. LENKA ZAJICKOVA
Prof. Lenka Zajickova from the Dept. Phys. Electronics of the Faculty of Science & Plasma technologies, Central European Institute for Technology, Masaryk University is a guest of Jun.-Prof. Dr. Jan Benedikt. She will give a talk on "Performance of Amine-Rich Plasma Polymers in Biosensing and Tissue Engineering" on Oct. 15, 2014 at 4:15 pm (NB 5/158).
EP5
DR. MANFRED KETTLITZ
Dr. Manfred Kettlitz from INP Greifswald is a guest of Prof. Dr. Uwe Czarnetzki from the Institute for Experimental Physics V on 10/07/2014.
EP5
PROF. YI-KANG PU
Prof. Dr. Yi-Kang Pu from the Department of Engineering Physics at Tsinghua University, Beijing, China is visiting Prof. Uwe Czarnetzki at the Chair of Plasma and Atomic Physics at Ruhr-Universität Bochum in July 2014.