Open Days

In order to popularize the research activities at BEO Musala in the summer of the last three years, Open Days were held within the framework of the campaign “BAS presents its Institutes”.

These days there was free access to those interested in getting to know the work of the Environmental Observatory.


  1. Ilia Penev, Christo Angelov, Todor Arsov, Stefan Georgiev, Nikolay Uzunov, “Climate change impact on 7Be activity seasonal variations in air aerosols near Moussala BEO”, Comptes rendus de l’Acade’mie bulgare des Sciences, Vol 70, No 9, pp. 1215- 1218, ISSN 1310-1331, IF: 0,251, 2017.
  2. Lauren Schmeisser, Elisabeth Andrews, John A. Ogren, Patrick Sheridan, Anne Jefferson, Sangeeta Sharma, Jeong Eun Kim, James P. Sherman, Mar Sorribas, Ivo Kalapov, Todor Arsov, Christo Angelov, Olga L. Mayol-Bracero, Casper Labuschagne, Sang-Woo Kim, András Hoffer, Neng-Huei Lin, Hao-Ping Chia, Michael Bergin, Junying Sun, Peng Liu, Hao Wu, “Classifying aerosol type using in situ surface spectral aerosol optical properties”, Atmos. Chem. Phys., 17, 12097-12120, IF: 5.72, 2017.
  3. N.Tyutyundzhiev, Ch.Angelov, K.Lovchinov, Hr.Nitchev, M.Petrov, T.Arsov, “Modeling of natural UV irradiation and comparative UV measurements at BEO „Moussala“ station(BG)”, IOP Conf. Series: Journal of Physics: Conf. Series 992 (2018) 012022, Q3
  4. I. Penev, H. Angelov, T. Arsov, St. Georgiev, N. Uzunov, “106Ru aerosol activity observation above southeast Europe in October 2017”, Comptes rendus de l’Acade’mie bulgare des Sciences, Vol 71, No 5, pp. 613- 618, ISSN 1310-1331, IF: 0,270, 2018 Q4
  5. Marco Pandolfi et al. “A European aerosol phenomenology – 6: scattering properties of atmospheric aerosol particles from 28 ACTRIS sites”, Atmos. Chem. Phys., 18, 7877–7911, IF: 5.72, 2018 Q1
  6. Martine Collaud Coen, Elisabeth Andrews, Diego Aliaga, Marcos Andrade, Hristo Angelov, Nicolas Bukowiecki, Marina Ealo, Paulo Fialho, Harald Flentje, A. Gannet Hallar, Rakesh Hooda, Ivo Kalapov, Radovan Krejci, Neng-Huei Lin, Angela Marinoni, Jing Ming, Nhat Anh Nguyen, Marco Pandolfi, Véronique Pont, Ludwig Ries, Sergio Rodríguez, Gerhard Schauer, Karine Sellegri, Sangeeta Sharma, Junying Sun, Peter Tunved, Patricio Velasquez, and Dominique Ruffieux, “Identification of topographic features influencing aerosol observations at high altitude stations”, Atmos. Chem. Phys., 18, 12289–12313, IF: 5.72, 2018
  7. V. Kleshtanova, Ch. Angelov, I. Kalapov, T. Arsov, G. Guerova, and V. Tonchev, “What one can learn from the cloudcondensation nuclei (CCN) size distributionsas monitored by the BEO Moussala?”, AIP Conference Proceedings 2075, 130026 (2019); https://doi.org/10.1063/1.5091311, https://aip.scitation.org/doi/10.1063/1.5091311
  8. A. Deleva, E. Krasteva, L. Vulkova, T. Dreischuh, “Model Forecasts Importance in LIDAR-Data Analysis”, AIP Conference Proceedings, vol.2075, 130020 (2019).
  9. A. Deleva, E. Krasteva, L. Vulkova, T. Dreischuh, “Thick Anthropogenic Aerosol Layers Detected by LIDAR above Sofia”, AIP Conference Proceedings, vol.2075, 130019 (2019).
  10. T. Dreischuh, Z. Peshev, I. Grigorov, A. Deleva, G. Kolarov, D. Stoyanov, “Remote Investigations of Near-Surface Atmospheric Aerosol Optical Properties over Sofia Urban Area”, AIP Conference Proceedings, vol.2075, 130021 (2019).
  11. S. Penchev, V. Pencheva, “Tracking – Gas Analyser of Biogas Methane Employing Paired Powerful Laser Diodes”, AIP Conference Proceedings, vol.2075, 120016-1-120016-7 (2019).
  12. A. Deleva, Z. Peshev, E. Krasteva, T. Dreischuh, “Simultaneous vertical LIDAR profiling of Saharan dust layers and high-altitude cirrus clouds in the troposphere”, Proceedings of SPIE, vol.11047, 1104712 (2019).
  13. A. Deleva, Z. Peshev, L. Valkova, T. Dreischuh, “Unusual wintertime transport of Saharan dust to Sofia, Bulgaria, detected by lidar”, Proceedings of SPIE, vol.11047, 1104711 (2019).
  14. Z. Peshev, A. Deleva, T. Dreischuh, “Saharan dust mixed with marine aerosols: Lidar measurements and characterization”, Proceedings of SPIE, vol.11047, 1104715 (2019).
  15. R. Angelova, L. Slavov, G. Kolarov, I. Grigorov, Ch. Ghelev, L. Gurdev, D. Stoyanov, “LIDAR and contact investigations of aerosol characteristics near high-traffic urban sites”, Proceedings of SPIE, vol.11047, 1104713 (2019).
  16. Ts. Evgenieva, V. Anguelov, L. Gurde, “Elastic-lidar signal statistics and sensing efficiency depending on the laser radiation wavelength”, Proceedings of SPIE, vol.11047, 1104716 (2019).
  17. V. Pencheva, S. Penchev, “Application of Paired Powerful Laser Diodes for Detection and Reconnaissance of Atmospheric Methane”, Proceedings of SPIE, vol.11047, 1104714 (2019).
  18. I. Sirkova, “Anomalous Tropospheric Propagation: Usage Possibilities and Limitations in Radar and Wireless Communications Systems”, AIP Conference Proceedings, vol.2075 (2019).
  19. The EARLINET publishing group 2000-2015 et al.“EARLINET All 2000-2015”, World Data Center for Climate (WDCC) at DKRZ (2018).
  20. A. Deleva, Z. Peshev, T. Dreischuh, D. Stoyanov, “LIDAR observations of aerosol loadings extended throughout the troposphere”, Proceedings of SPIE vol.10226, 102260X (2017).
  21. Z. Peshev, A. Deleva, T. Dreischuh, D. Stoyanov, “Lidar measurements of wildfire smoke aerosols in the atmosphere above Sofia, Bulgaria”, Proceedings of SPIE, vol.10226, 102260Y (2017).
  22. T. Dreischuh, I. Grigorov, Z. Peshev, A. Deleva, G. Kolarov, D. Stoyanov, “Lidar Mapping of Near-Surface Aerosol Fields”, Chapter 4 in “Aerosols – Science and Case Studies”, ed. K. Volkov; InTech, Rijeka, Slovenia, 86-107 (2016).
  23. T. Dreischuh, A. Deleva, Z. Peshev, I. Grigorov, G. Kolarov, D. Stoyanov, “Lidar investigations of atmospheric aerosols over Sofia,” Bulg. J. Phys., vol.43(4), 266-278 (2016).
  24. Z. Peshev, T. Dreischuh, Ts. Evgenieva, A. Deleva, D. Tonev, D. Stoyanov, “Lidar observations of long-range transported Saharan dust over Sofia, Bulgaria: a case study of dust mixed with local aerosols,” J. Appl. Remote Sens., vol.10(3), 036009 (2016).
  25. Wandinger, U. et al. “EARLINET instrument intercomparison campaigns: overview on strategy and results”, Atmos. Meas. Tech., vol.9, 1001-1023 (2016).
  26. Z. Peshev, Tz. Evgenieva, T. Dreischuh, D. Stoyanov, “Two-wavelength lidar characterization of optical, dynamical, and microphysical properties of Saharan dust layers over Sofia, Bulgaria“, Proceedings of SPIE, vol.9447, 94470R (2015).
  27. I. Grigorov, A. Deleva, D. Stoyanov, N. Kolev, G. Kolarov, “LIDAR detection of forest fire smoke above Sofia”, Proceedings of SPIE, vol.9447, 94470U (2015).
  28. N. Kolev, Ts. Evgenieva, I. Grigorov, A. Deleva, D. Ivanov, V. Danchovski, Pl. Savov, D. Petkov, “Ceilometer observation of Saharan dust over mountain valley of Sofia, Bulgaria”, Proceedings of SPIE, vol.9447, 94470Q (2015).
  29. A. Deleva, “LIDAR registration of the vertical stratification of Saharan dust incursion over Sofia”, Bulgarian Geophysical Journal, vol.40, 33-49 (2014).
  30. D. Stoyanov, T. Dreischuh, I. Grigorov, Z. Peshev, A. Deleva, G. Kolarov, L. Gurdev, N. Kolev, Ts. Evgenieva, V. Mitev, E. Toncheva, V. Pencheva, “LIDAR sensing of aerosol processes over Sofia region in the frame of the European Aerosol Research Lidar Network (EARLINET)”, Bulgarian Journal of Physics, vol.40 , 186-192 (2013).
  31. Pappalardo, G. et al. “Four-dimensional distribution of the 2010 Eyjafjallajökull volcanic cloud over Europe observed by EARLINET”, Atmospheric Chemistry and Physics, vol.13 (8), 4429-445 (2013).
  32. Z. Peshev, T. Dreischuh, E. Toncheva, D. Stoyanov, “Lidar observations and characterization of biomass burning aerosols over Sofia: Long-range transport of forest wildfire smoke“, Proceedings of SPIE, vol.8770, 87700Z (2013).
  33. D. Stoyanov, I. Grigorov, G. Kolarov, Z. Peshev, T. Dreischuh, “LIDAR Atmospheric Sensing by Metal Vapor and Nd:YAG Lasers”, Chapter 14 in “Advanced Photonic Sciences”, M. Fadhali (Ed.), InTech, ISBN 978-953-51-0153-6, 30pp (2012).
  34. J. Meier, I. Tegen, I. Mattis, R. Wolke, L. Alados Arboledas, A. Apituley, D. Balis, F. Barnaba, A. Chaikovsky, M. Sicard, G. Pappalardo, A. Pietruczuk, D. Stoyanov, F. Ravetta, V. Rizi, “A regional model of European aerosol transport: Evaluation with sun photometer, lidar and air quality data”, Atmospheric Environment, vol.47, 519-532 (2012).
  35. Pappalardo, G et al. “EARLINET correlative measurements for CALIPSO: First intercomparison results”, Journal of Geophysical Research Atmospheres, vol.115, 4 (2010), ISSN:21698996.
  36. Marco Pandolfi, …., Christo Angelov, …et.al, “A European aerosol phenomenology – 6: scattering properties of atmospheric aerosol particles from 28 ACTRIS sites”, Atmos. Chem. Phys., 18, 7877–7911, IF: 5.72, 2018 Q1
  37. Nikolay Tyutyundzhiev, Christo Angelov, Konstantin Lovchinov, Todor Arsov, and Hristo Nichev, “Open-source tool for solar UV measurements”,
    AIP Conference Proceedings 2075, 130025 (2019); https://doi.org/10.1063/1.5091310
  38. O. Masson, …, H. Angelov, I. Penev, et.al., “Airborne concentrations and chemical considerations of radioactive ruthenium from an undeclared major nuclear release in 2017”, 16750–16759, PNAS, August 20, 2019, vol. 116, no. 34, www.pnas.org/cgi/doi/10.1073/pnas.1907571116, IF: 9.58, SJR: 5.6, Q1
  39. Baars, H., Ansmann, A., Ohneiser, K., Haarig, M., Engelmann, R., Althausen, D., Hanssen, I., Gausa, M., Pietruczuk, A., Szkop, A., Stachlewska, I. S., Wang, D., Reichhardt, J., Skupin, A., Mattis, I., Trickl, T., Vogelmann, H., Navas-Guzmán, F., Haefele, A., Acheson, K., Ruth, A. A., Tatarov, B., Müller, D., Hu, Q., Podvin, T., Goloub, P., Vesselovski, I., Pietras, C., Haeffelin, M., Fréville, P., Sicard, M., Comerón, A., Fernández García, A. J., Molero Menéndez, F., Córdoba-Jabonero, C., Guerrero-Rascado, J. L., Alados-Arboledas, L., Bortoli, D., Costa, M. J., Dionisi, D., Liberti, G. L., Wang, X., Sannino, A., Papagiannopoulos, N., Boselli, A., Mona, L., D’Amico, G., Romano, S., Perrone, M. R., Belegante, L., Nicolae, D., Grigorov, I.,Gialitaki, A., Amiridis, V., Soupiona, O., Papayannis, A., Mamouri, R.-E., Nisantzi, A., Heese, B., Hofer, J., Schechner, Y. Y., Wandinger, U., and Pappalardo, G.: “The unprecedented 2017–2018 stratospheric smoke event: Decay phase and aerosol properties observed with EARLINET”, Atmos. Chem. Phys., 19, 15183–15198 (2019).
  40. A. Deleva, Z. Peshev, T. Dreischuh, A. Chaikovsky, A. Slesar, and A. Fedarenka: “Lidar observations of Saharan dust loads above Sofia, Bulgaria: Dust layers extending throughout the troposphere (a case study)”, Journal of Applied Remote Sensing, 14, 0145041 (2020). DOI: 10.1117/1.JRS.14.014504.