Updated on 5.08.2002

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1. Analysis of the calibration results obtained with Liulin-4J spectrometer-dosimeter on... Uchihori, Y. / Kitamura, H. / Fujitaka, K. / Dachev, T.P. / Tomov, B.T. / Dimitrov, P.G. / Matviichuk, Y., Radiation Measurements, Apr 2002 We are developing a portable dosimeter (Liulin-4J) based on a silicon semiconductor detector for use in measuring the absorbed dose from primary or secondary cosmic rays to astronauts and airplane crews. The dosimeter can measure not... Full text article available from   2. Long-term variations and interrelations of ENSO, NAO and solar activity Kirov, B. / Georgieva, K., Physics and Chemistry of the Earth, Parts A/B/C, Jan 2002 Much attention is recently paid to the global warming observed in the 20th century, and especially to the relative impact of natural and anthropogenic factors responsible for it. Many studies have revealed a good correlation, up to the... Full text article available from   3. Long-term changes in atmospheric circulation, earth rotation rate and north-south sol... Georgieva, K., Physics and Chemistry of the Earth, Parts A/B/C, Jan 2002 Earlier studies have demonstrated a relation between long-term changes in the Earth's rotation rate and the prevalence of zonal or meridional types of circulation. The results, however, have been confined to the 20th century and to the... Full text article available from   4. Modeling cosmic ray ionization in an oblate planetary ionosphere Kostov, V.I. / Velinov, P.I.Y., Advances in Space Research, Jan 2001 Considering cosmic ray ionization in the lower ionosphere in an oblate planetary body, we have derived a modified Chapman function for an ellipsoid. Velinov (1968) introduced the ''classic'' Chapman function for a spherical planet in... Full text article available from   5. Sunrise and sunset effects on solar heating in the Jovian thermosphere and ionosphere... Kostov, V.I. / Velinov, P.I.Y., Advances in Space Research, Jan 2001 We present some calculations on the effects of oblateness on the solar heating process as considered in the Jovian Ionospheric Model by Achilleos et al. (1998). Since Jupiter has significant oblateness we have to use a new approach for... Full text article available from   6. Determination of electron production rates caused by cosmic ray particles in ionosphe... Velinov, P.I.Y. / Buchvarova, M.B. / Mateev, L. / Ruder, H., Advances in Space Research, Jan 2001 Cosmic rays (CR) create the lower parts of planetary ionospheres. The observed CR spectrum can be distributed into the following five intervals: I (E = 3.106 - 1011 GeV/n), II (E = 3.102 - 3.106 GeV/n), III (E = 30 MeV/n -... Full text article available from   7. Spatial summation of blue-on-yellow light increments and decrements in human vision Vassilev, A. / Zlatkova, M. / Manahilov, V. / Krumov, A. / Schaumberger, M., Vision Research, Apr 2000 In the primate retina, blue-OFF cells are less numerous than blue-ON cells but no psychophysical equivalent of this asymmetry has been found so far. The hypothesis put forward in the present study is that the ON-OFF asymmetry should... Full text article available from   8. Heart rate variability during the 10-day Bulgarian-Russian space flight onboard the M... I Stoilova / T Zdravev / T Yanev / S Zdraveva, Aviakosm Ekolog Med, Feb 2000 No Abstract Available MEDLINE Citation on   9. Solar cycle variations of MIR radiation environment as observed by the LIULIN dosimet... Dachev, T.P. / Tomov, B.T. / Matviichuk, Y.N. / Koleva, R.T. / Semkova, J.V. / Petrov, V.M. / Benghin, V.V. / Ivanov, Y.V. / Shurshakov, V.A. / Lemaire, J.F., Radiation Measurements, Jun 1999 Measurements on board the MIR space station by the Bulgarian-Russian dosimeter LIULIN have been used to study the solar cycle variations of the radiation environment. The fixed locations of the instrument in the MIR manned compartment... Full text article available from   10. Solar particle events observed on MIR station Shurshakov, V.A. / Petrov, V.M. / Ivanov, Y. / Bondarenko, V.A. / Tzetlin, V.V. / Makhmutov, V.S. / Dachev, T. / Semkova, J.V., Radiation Measurements, Jun 1999 Radiation impact of the SPEs on board the MIR space station and in the interplanetary space is discussed in the report. The data of the on-board radiation dosimeter R-16 were used to measure the SPE absorbed doses. Some of SPEs (such as... Full text article available from   11. Solar cycle variations of MIR radiation environment as observed by the LIULIN dosimet... Dachev TsP / B T Tomov / Matviichuk YuN / R T Koleva / J V Semkova / V M Petrov / V V Benghin / Ivanov YuV / V A Shurshakov / J F Lemaire, Radiat Meas, Jun 1999 Measurements on board the MIR space station by the Bulgarian-Russian dosimeter LIULIN have been used to study the solar cycle variations of the radiation environment. The fixed locations of the instrument in the MIR manned compartment behind 6-15 g/cm2... MEDLINE Citation on   12. Inner magnetosphere variations after solar proton events. Observations on Mir space s... Dachev TsP / J V Semkova / Matviichuk YuN / B T Tomov / R T Koleva / P T Baynov / V M Petrov / V V Shurshakov / Y u Ivanov, Adv Space Res, Feb 1998 Measurements on board the Mir space station have been used to study the dose rate and the particle flux distribution in the inner magnetosphere. The measurements have been performed with the Bulgarian-Russian dosimeter-radiometer Liulin. The paper... MEDLINE Citation on   13. Direct comparison of transient radiation belt topology and dynamics in 1991 based on ... Shurshakov, V.A. / Huston, S.L. / Dachev, T.P. / Petrov, V.M. / Ivanov, Y.V. / Semkova, J.V., Advances in Space Research, Jan 1998 In March 1991 the CRRES spacecraft measured a new transient radiation belt resulting from a solar proton event and subsequent geomagnetic disturbance. The presence of this belt was also noted by dosimeter-radiometers aboard the Mir... Full text article available from   14. Investigation of the vertical profile of the aerosol scattering in the atmosphere by ... Krezhova, D.D. / Zdravev, T.K. / Kovatchev, S.T. / Mishev, D.N. / Nikolov, H.S., Advances in Space Research, Jan 1998 An approach is suggested and applied to determine the atmospheric optical depth parameters from spectral solar irradiance data provided by the multichannel trace spectrometric system ''Spectrum 256''. The system ''Spectrum 256'' has... Full text article available from   15. Analysis of the pre-flight and post-flight calibration procedures performed on the Li... T s Dachev / J Semkova / V Petrov / V Redko / V Bengin / T Kostereva / J Miller / L Heilbronn / C Zeitlin, Acta Astronaut, Jan 1998 Liulin, a dosimetry-radiometry system, was developed to satisfy the requirements for active flux and dose rate measurements for the flight of the second Bulgarian cosmonaut in 1988. The system consists of a compact battery-operated silicon solid state... MEDLINE Citation on   16. Analysis of the soil-vegetation system state using the theory of the mixed classe... Mishev, D.N., Acta Astronautica, May 1997 Recently many investigations of the soil-vegetation system have used the new coordinate system B-G for analysis and assessment mainly of the phytomass and humus content: along the B axis are located the basic soil types and their... Full text article available from   17. Analysis of heart rate variability during short-term space flight. I Stoilova / T Yanev, Dokl Bolg Akad Nauk, Feb 1997 The heart rate (h.r.) of normal healthy subjects varies in rest, under high-load conditions and in pathology. The heart rate variability (h.r.v.) integrates many mechanisms in- and outside the central nervous system, which influence and regulate the... MEDLINE Citation on   18. A quasi-DC model of electric fields in the ionosphere-ground region due to electrifie... Tonev, P.T. / Velinov, P.I.Y., Journal of Atmospheric and Terrestrial Physics, Jul 1996 The penetration of the quasi-DC electric fields, E, due to electrified clouds, into the middle- and high-latitude ionosphere is theoretically studied during the initial stage of cloud charge separation. The electrification process is... Full text article available from   19. Tissue equivalent detector data obtained recently on Mir space station. Comparison wi... Bottollier-Depois, J.F. / Lebaron-Jacobs, L. / Siegrist, M. / Duvivier, E. / Almarcha, B. / Dachev, T.P. / Semkova, J.V. / Matviichuk, Y.N. / Koleva, R.T. / Tomov, B.T., Advances in Space Research, Jan 1996 Tissue equivalent and Solid State Detector (SSD) measurements of the radiation environment inside the Mir space station were performed during the Antares mission in 1992 and long period after it. Interesting results about radiation... Full text article available from   20. New results for the space radiation environment of MIR space station obtained by Liul... Dachev, T.P. / Semkova, J.V. / Matviichuk, Y.N. / Koleva, R.T. / Tomov, B.T. / Baynov, P.T. / Bottollier-Depois, J.F. / Nguen, V.D. / Lebaron-Jacobs, L. / Siegrist, M., Acta Astronautica, Oct 1995 Since 1988 high sensitivity semiconductor dosimeter-radiometer Liulin worked on board of MIR space station. Device measured the absorbed dose rate and the flux of penetrating particles. The analysis of the data hows the following... Full text article available from   21. New results for the space radiation environment of MIR space station obtained by Liul... Dachev TsP / J V Semkova / Matviichuk YuN / R T Koleva / B T Tomov / P T Baynov / J F Bottollier-Depois / V D Nguen / L Lebaron-Jacobs / M Siegrist / E Duvivier / B Almarcha / V M Petrov / V V Shurshakov, Acta Astronaut, Oct 1995 Since 1988 high sensitivity semiconductor dosimeter-radiometer "Liulin" worked on board of MIR space station. Device measured the absorbed dose rate and the flux of penetrating particles. The analysis of the data shows the following new results: In... MEDLINE Citation on   22. Modelling the penetration of thundercloud electric fields into the ionosphere Velinov, P.I. / Tonev, P.T., Journal of Atmospheric and Terrestrial Physics, May 1995 In a previous paper, we considered the penetration of DC thundercloud electric fields E into the ionosphere and also into the region between the ionosphere and the ground (Velinov and Tonev, 1994). In the present paper, we extend the... Full text article available from   23. Dosimetric investigations on Mars-96 mission. J Semkova / T s Dachev / Y u Matviichuk / R Koleva / B Tomov / P Baynov / V Petrov / V Nguyen / M Siegrist / J Chene / C d'Uston / F Cotin, Adv Space Res, Oct 1994 The dosimetric experiments Dose-M and Liulin as part of the more complex French-German-Bulgarian-Russian experiments for the investigation of the radiation environment for Mars-96 mission are described. The experiments will be realized with... MEDLINE Citation on   24. A case study of subauroral ion drift velocity jets by means of dynamics explorer-2 an... Bankov, L.G. / Stanev, G.A. / Vassileva, A.K. / Kirova, V.A. / Danov, D.L. / Hanson, W.B. / Heelis, R.A. / Anderson, P.C., Advances in Space Research, Jan 1996 Satellites INTERCOSMOS Bulgaria-1300 (ICB-1300) and Dynamics Explorer-2 (DE-2) were launched close together early in August 1981. The satellite data base from both DE-2 and ICB-1300 covers almost a two years period. Data from both... Full text article available from

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