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Multicomponent wave measurements performed by the DEMETER spacecraft
Kotková, Marie ; Němec, František (advisor) ; Chum, Jaroslav (referee)
We analyze data from wave measurements performed by the DEMETER spacecraft in the frequency range up to 1250 Hz. We investigate the dependence of wave parameters on daytime, geomagnetic latitude, geomagnetic activity, and season, both globally and in the geomagnetic longitude range corresponding to America, where there is a substantial seasonal variation in lightning occurrence. We show that, during the day, there is generally a prevalence of waves propagating from larger radial distances, i.e. generated by plasma instabilities; during the night, the situation is opposite, indicating a prevalence of waves generated by lightning activity. The difference in wave vector directions detected above America is the largest between winter days during elevated geomagnetic activity and summer nights during low geomagnetic activity. We use the typical wave vector directions to trace back the tentative source region of the waves detected during the daytime half-orbits.
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Parkour and its influence on the personality of parkourists
Chum, Jaroslav ; Kašparová, Alena (advisor) ; Novotná, Viléma (referee)
Title: Parkour and its influence on the personality of the traceur Objectives: Find out in what way and in which aspects parkour influences the personality of its users. Methods: In this thesis, a mixed research method was used, namely the case study method, which is able to affect the object under study in its depth. The main research material chosen was a non-standardized structured interview consisting of 40 questions asking about general characteristics, experiences, opinions, attitudes, experienced feelings and manners along with aspects affecting the personality of the individuals. A standardized EOD-A questionnaire examining personality characteristics was chosen as supplementary material to enhance the research. The research sample consists of 6 respondents, each of whom is involved in a slightly different industry. Results: All respondents were successfully tested on how and in which aspects parkour influences their personality. The main cause that confirms that parkour is able to modify and shape the personality of individuals was tested by the length of time the interviewed individuals have been practicing parkour. During this time, they develop a very close relationship with parkour, which, by providing its users with a lot of intense feelings that are always eventually reflected as...
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Changes in motivation and fear of selected individuals during the first jumps
Chum, Jaroslav ; Dvorský, Jaroslav (advisor) ; Fiala, Miloš (referee)
Title: Changes in motivation and fear of selected individuals during the first jumps Objectives: Describe the process of jumping off a plane in terms of emotions experienced during it Methods: In this work is used the method of mixed research, especially the method of case studies that describe the researched object in depth. As a research material, were chose 3 standardized questionnaires (16 PF, EOD-A, Monitoring changes in individual activities) and one non-standardized structured interview on 20 questions examining the experience of fear during the jump and 20 questions identifying motivational motives to perform the jump. The research sample was 3 subjects who participated in the same parachuting course. Results: All subjects were successfully examined for their emotions during the parachute jump process. All respondents stated that the main motivational aspect that caused their participation in the parachuting course was the need to try something new. In terms of fear, individuals showed the greatest concern about not opening the main parachute and the subsequent situation where they would be forced to open a backup parachute. Fear was also expressed about possible slipping out of the parachute harness, landing outside the landing zone somewhere in the meadow or possible fractures of the...
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Lightning-Related Electromagnetic Wave Phenomena in the Earth's Magnetosphere
Záhlava, Jan ; Němec, František (advisor) ; Chum, Jaroslav (referee) ; Manninen, Jyrki (referee)
Title: Lightning-Related Electromagnetic Wave Phenomena in the Earth's Magnetosphere Author: Jan Záhlava Department: Department of Surface and Plasma Physics Supervisor: doc. RNDr. František Němec, PhD., Department of Surface and Plasma Physics Abstract: The thesis focuses on lightning-related electromagnetic wave phenomena observed by spacecraft in the Earth's inner magnetosphere. Two different approaches are used to identify the frequency and spatial extent where lightning generated emissions significantly contribute to the overall wave intensity. First, whistler detections onboard the DEMETER spacecraft are used to sort the measurements according to the whistler activity. Second, we use a geographic distribution of lightning activity and analyze a dependence of the overall wave intensity on geomagnetic longitude. We show that, especially during the night, the overall wave intensity observed in the plasmasphere is well correlated with lightning activity. The other focus of the study is on special electromagnetic wave events consisting of alternating frequency bands of enhanced and reduced wave intensity formed in the ionosphere due to lightning. We analyze their occurrence and parameters, and we suggest a possible mechanism of their formation. Keywords: lightning, waves in plasma, whistlers, plasmasphere
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Changes in motivation and fear of selected individuals during the first jumps
Chum, Jaroslav ; Dvorský, Jaroslav (advisor) ; Fiala, Miloš (referee)
Title: Changes in motivation and fear of selected individuals during the first jumps Objectives: Describe the process of jumping off a plane in terms of emotions experienced during it Methods: In this work is used the method of mixed research, especially the method of case studies that describe the researched object in depth. As a research material, were chose 3 standardized questionnaires (16 PF, EOD-A, Monitoring changes in individual activities) and one non-standardized structured interview on 20 questions examining the experience of fear during the jump and 20 questions identifying motivational motives to perform the jump. The research sample was 3 subjects who participated in the same parachuting course. Results: All subjects were successfully examined for their emotions during the parachute jump process. All respondents stated that the main motivational aspect that caused their participation in the parachuting course was the need to try something new. In terms of fear, individuals showed the greatest concern about not opening the main parachute and the subsequent situation where they would be forced to open a backup parachute. Fear was also expressed about possible slipping out of the parachute harness, landing outside the landing zone somewhere in the meadow or possible fractures of the...
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Lightning-Related Electromagnetic Wave Phenomena in the Earth's Magnetosphere
Záhlava, Jan ; Němec, František (advisor) ; Chum, Jaroslav (referee) ; Manninen, Jyrki (referee)
Title: Lightning-Related Electromagnetic Wave Phenomena in the Earth's Magnetosphere Author: Jan Záhlava Department: Department of Surface and Plasma Physics Supervisor: doc. RNDr. František Němec, PhD., Department of Surface and Plasma Physics Abstract: The thesis focuses on lightning-related electromagnetic wave phenomena observed by spacecraft in the Earth's inner magnetosphere. Two different approaches are used to identify the frequency and spatial extent where lightning generated emissions significantly contribute to the overall wave intensity. First, whistler detections onboard the DEMETER spacecraft are used to sort the measurements according to the whistler activity. Second, we use a geographic distribution of lightning activity and analyze a dependence of the overall wave intensity on geomagnetic longitude. We show that, especially during the night, the overall wave intensity observed in the plasmasphere is well correlated with lightning activity. The other focus of the study is on special electromagnetic wave events consisting of alternating frequency bands of enhanced and reduced wave intensity formed in the ionosphere due to lightning. We analyze their occurrence and parameters, and we suggest a possible mechanism of their formation. Keywords: lightning, waves in plasma, whistlers, plasmasphere
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