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Dynamika radiačních pásů pozorovaná družicemi na nízkých výškách
Thesis title in Czech: Dynamika radiačních pásů pozorovaná družicemi na nízkých výškách
Thesis title in English: Radiation belt dynamics observed by low-orbiting satellites
Academic year of topic announcement: 2019/2020
Type of assignment: dissertation
Thesis language:
Department: Department of Surface and Plasma Science (32-KFPP)
Supervisor: doc. RNDr. František Němec, Ph.D.
Advisors: RNDr. Peter Rubovič, Ph.D.
Fluxes of energetic particles trapped in the Van Allen radiation belts are ultimately controlled by several competing phenomena. Most importantly, they can be energized due to both radial diffusion and wave-particle interactions. These can be, on the other hand, responsible for breaking down the first adiabatic invariant, pitch angle diffusion, and subsequent precipitation. Additionally, during periods of sudden magnetospheric compressions, particles primarily at larger L-shells can be lost due to a magnetopause shadowing. We suppose to use energetic particle data obtained by particle instruments at low altitude spacecraft to systematically analyze radiation belt dynamics and individual phenomena taking place. An example of such instrument is a pixelized detector of the Timepix family developed within the Medipix collaboration installed on satellites by an IEAP CTU team. A special attention should be paid to energetic particle flux variations at the times of interplanetary shock arrivals and substorms, and to related variations of the global magnetic field configuration and simultaneously observed wave phenomena. Furthermore, the possibility to develop a dedicated detector for such phenomena should be investigated.
[1] M. G. Kivelson, C. T. Russell: Introduction to Space Physics. University Press, Cambridge 1995.
[2] F. F. Chen: Introduction to Plasma Physics and Controlled Fusion. Springer, New York, 1984, ISBN 0-306-41332-9.
[3] A. D. M. Walker: Plasma Wawes in the Magnetosphere. Springer Verlag, Berlin, Heidelberg 1993, ISBN 3-540-56046-7.
[4] Further literature will be agreed with the supervisor.
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