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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...
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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...
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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...
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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 -...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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