Volume 16 / C o n t e n t s
1. Petar Getsov
BULGARIAN SPACE STUDIES – PAST, PRESENT, AND FUTURE		 5
2. Tania Ivanova, Svetlana Sapunova, Plamen Kostov, Ivan Dandolov
FIRST SUCCESSFUL SPACE SEED-TO-SEED PLANT GROWTH EXPERIMENT
IN THE SVET-2 SPACE GREENHOUSE IN 1997		 12
3. Pavlin Gramaticov, Tanya Ivanova
SVET-2 Space Greenhouse Light Unit		 24
4. Genadiy Gdalevich, Stefan Chapkanov, Tania lvanova, Maria Petrunova, Venzislav Markov
RESULTS OBTAINED ONBBOARD THE INTERCOSMOS-19 SATELLITE USING THE P4 DEVICE		 35
5. Maria Petrunova, Boncho Peev
DIRECT DETERMINATION OF IONOSPHERIC PLASMA STRUCTURAL PARAMETERS
IN THE EXPERIMENT WITH A SPHERICAL IONTTAP		 41
6. Dimitar Teodossiev, Medy Astrukova, Rumen Shkevov, Georgi Galev
LOW-FREQUENCY ELECTRIC FIELD MEASUREMENT PROBES ON BOARD INTERCOSMOS - 24 AKTIVEN SATELLITE		 46
7. Medy Astrukova
ON THE CONTACT POTENTIAL DIFFERENCE AND THE METHODS FOR ITS MEASUREMENT
FOR THE PURPOSES OF SPACE TRIBOLOGY		 54
8. Kalinka Bakalova, Vitchko Tsanev
EVALUATION OF THE ATMOSPHERIC OPTICAL CHARACTERISTICS IMPACT
ON THE SOLAR CORONA OBSERVATION		 61
9. Nikola Georgiev, Rumen Nedkov, Dora Nedelcheva
USING AN ORBITAL METHOD AND GPS MEASUREMENTS OF THE GROUND CONTROL POINTS
IN GEOREFERENCE OF SPACE IMASES		 70
10. Nikolai Bankov, Liudmila Todorieva
DATA PROCESSING OF MICROWAVE SYSTEM R-400 ON BOARD OF THE MIR SPACE STATION		 82
11. Garo Mardirossian, Dimitar Danov
PRELIMINARY ANALYSIS OF THE BALISTIC PARAMETERS
OF A PENETRATOR FOR ECOLOGICAL STUDIES		 89
12. Georgi Jelev, Eugenia Rumenina
MONITORING THE STUDEN KLADENETS RESERVOIR USING AIR AND SPACE IMAGES		 97
13. Venzislav Markov
SYSTEMS FOR PRELAUNCH TEST AND INFLIGHT CALIBRATION
OF THE PODSOLNUH DEVICE OF THE GRANAT PROJECT		 107
14. Ventsislav Markov, Arkadii Melioranski, Lachezar Filipov
PODSOLNUH-D X-RAY TELESCOPE FROM THE GRANAT PROJECT:
RESEARCH PROGRAM AND SOME SPECIFICS IN ITS HARWARE IMPLEMENTATION		 112
15. Hristo Hristov, Victor Baranov
ISOPERIMETRICAL TASK FOR OPTIMIZATION OF THE CUMULATIVE CHARGE
FOR PSEUDOMETEORITE PARTICLES		 119
16. Vladimir Damgov, Petar Georgiev
NON-LINEAR OSCILLATOR UNDER EXTERNAL SYNCHRONIZING INFLUENCE:
COMPARISON OF PERTURBATION AND CANONICAL METHODS OF ANALYSIS		 124
  Scientific announcment  
17. Maria Dimitrova
ON THE EXPECTED OBSERVATIONAL BEHAVIOUR OF THE ACCRETION FLOW IN A CLOSE BINARY		 144
18. Maria Dimitrova
THE INFLUENCE OF THE INFLOW GAS TEMPERATURE ON THE EFFICIENCY
OF THE ACCRETION ENERGY PRODUCING		 148