|
|
Study of ionospheric variability
Mošna, Zbyšek ; Koucká Knížová, Petra (advisor) ; Truhlík, Vladimír (referee) ; Němec, František (referee)
High variability of the ionosphere is connected to geomagnetic, solar, and neutral atmosphere wave activity. Results of scaling analysis of solar data (F10.7, SSN), geomagnetic indices (Dst, Kp, AE), and ionospheric critical frequencies (foF2) show similar structure of Kp, AE and foF2 at periods in the range from 4 to 32 days. Data structure depends on the location of ionospheric stations. Correlation coefficients between foF2 and geomagnetic and solar indices depend on length of time scale. We show that vertical coupling exists between neutral atmosphere activity and sporadic E layer area. This connection is located predominantly on periods corresponding to internal modes of planetary waves. Interplanetary magnetic field discontinuities (Coronal mass ejections, Magnetic clouds, Hight speed solar streams) affect strongly the ionosphere. Analysed events lead to lowering of foF2, increase in heights of the layer F2 and oscillations of hmF2 and foF2 on periods in the order of hours. Powered by TCPDF (www.tcpdf.org)
|
|
|
Attitude control of the MAGION spacecraft
Pulkrábková, Martina ; Santolík, Ondřej (advisor) ; Truhlík, Vladimír (referee)
This thesis is divided into two parts. The first part explains development and history of the first Czechoslovak satellites Magion. Satellites Magion were developed for the Earth's ionosphere and magnetosphere research. The thesis describes the beginning of the project, Magion's technical data, its construction problems and interesting details from the background of the project. The second part of this thesis explains the Magion stabilization by its rotation, where properties of a free gyroscope are used. The text is written for students at secondary schools and also for their teachers. Because of it, everything is explained without using differential or integral calculus. The whole explanation is structured continuously, it supposes only basic knowledge, begins from the movement on the circle, continues through moments of inertia and angular momentum and ends by explanation of a free movement of the gyroscope. The whole theory is illustrated by stabilization of the satellite Magion 4 and by the experiments made during the project.
|
|
|
Study of ionospheric variability
Mošna, Zbyšek ; Koucká Knížová, Petra (advisor) ; Truhlík, Vladimír (referee) ; Němec, František (referee)
High variability of the ionosphere is connected to geomagnetic, solar, and neutral atmosphere wave activity. Results of scaling analysis of solar data (F10.7, SSN), geomagnetic indices (Dst, Kp, AE), and ionospheric critical frequencies (foF2) show similar structure of Kp, AE and foF2 at periods in the range from 4 to 32 days. Data structure depends on the location of ionospheric stations. Correlation coefficients between foF2 and geomagnetic and solar indices depend on length of time scale. We show that vertical coupling exists between neutral atmosphere activity and sporadic E layer area. This connection is located predominantly on periods corresponding to internal modes of planetary waves. Interplanetary magnetic field discontinuities (Coronal mass ejections, Magnetic clouds, Hight speed solar streams) affect strongly the ionosphere. Analysed events lead to lowering of foF2, increase in heights of the layer F2 and oscillations of hmF2 and foF2 on periods in the order of hours. Powered by TCPDF (www.tcpdf.org)
|
|
|
Attitude control of the MAGION spacecraft
Pulkrábková, Martina ; Santolík, Ondřej (advisor) ; Truhlík, Vladimír (referee)
This thesis is divided into two parts. The first part explains development and history of the first Czechoslovak satellites Magion. Satellites Magion were developed for the Earth's ionosphere and magnetosphere research. The thesis describes the beginning of the project, Magion's technical data, its construction problems and interesting details from the background of the project. The second part of this thesis explains the Magion stabilization by its rotation, where properties of a free gyroscope are used. The text is written for students at secondary schools and also for their teachers. Because of it, everything is explained without using differential or integral calculus. The whole explanation is structured continuously, it supposes only basic knowledge, begins from the movement on the circle, continues through moments of inertia and angular momentum and ends by explanation of a free movement of the gyroscope. The whole theory is illustrated by stabilization of the satellite Magion 4 and by the experiments made during the project.
|
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
guest ::
