Volume 29 / C o n t e n t s

1. Alexander Shibaev
CONNECTION BETWEEN PERIOD OF LOW-FREQUENCY COMPONENT WOLF'S NUMBERS (WNS)
AND LENGTH OF WOLF'S NUMBERS SERIES
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.01
5
2. Dimitrinka Tomova, Peter Velinov, Yordan Tassev
COMPARISON BETWEEN EXTREME SOLAR ACTIVITY DURING PERIODS MARCH 15-17, 2015
AND SEPTEMBER 4-10, 2017 AT DIFFERENT PHASES OF SOLAR CYCLE 24
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.02
10
3. Yana Asenovska, Simeon Asenovski
HIGH SPEED SOLAR WIND STREAMS OVER THE LAST FOUR SOLAR CYCLES
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.03
30
4. Ivan Yanev
SATELLITE SENSORS USED IN THERMAL REMOTE SENSING
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.04
35
5. Ivan Yanev, Lachezar Filchev
ASSESSMENT OF THE LAND SURFACE TEMPERATURE DYNAMICS IN THE CITY OF SOFIA
USING LANDSAT SATELLITE DATA
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.05
45
6. Ilina Kamenova, Lachezar Filchev, Iliana Ilieva
REVIEW OF SPECTRAL VEGETATION INDICES AND METHODS
FOR ESTIMATION OF CROP BIO PHYSICAL VARIABLES
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.06
72
7. Dimitar Dimitrov
SPACE TECHNOLOGIES FOR STUDYING AND MONITORING OF SEISMOGENIC ZONES
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.07
83
8. Petar Getsov, Wang Bo, Dimo Zafirov, Georgi Sotirov, Stanimir Nachev, Ruslan Yanev,
Pavlin Gramatikov, Valentin Atanassov, Hristo Lukarski, Svetoslav Zabunov
AN UNMANNED AERIAL SURVEILLANCE SYSTEM IN URBAN ENVIRONMENTS
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.08
94
9. Petar Getsov, Wang Bo, Svetoslav Zabunov, Garo Mardirossian
INNOVATIONS IN THE AREA OF UNMANNED AERIAL VEHICLES
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.09
111
10. Pavlin Gramatikov
ELECTRIC MOTOR-GENERATORS FOR UNMANNED AERIAL VEHICLES
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.10
120
11. Boris Hotinov, Pavlin Gramatikov
ONBOARD DIGITAL BLOCK FOR ELECTRIC FIELD MEASUREMENTS IN SPACE
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.11
133
12. Konstantin Metodiev
GENERATING A PULSE-WIDTH MODULATED SIGNAL BY MEANS OF TIMER MODULE INTERRUPT
OF PIC18F2550 MCU
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.12
141
13. Peter I. Y. Velinov
DEVELOPMENT OF ADVANCED SPACE SCIENCES AFTER FIRST ARTIFICIAL SATELLITE.
60-TH ANNIVERSARY OF THE SPACE AGE
DOI: http://dx.doi.org/10.7546/AeReBu.29.18.01.13
147