ContentsT. Harinarayana, B. Srebrov, K. Veeraswamy, K. Bojadgieva ,V. Hristov – Magnetoelluric survey in Burgas hydrothermal basin (se Bulgaria)B. Markova, R. Mitzeva – Instability indices as an indicator of thunderstorms in Eastern Bulgaria – preliminary resultsA. Deleva – Lidar monitoring of clouds and aerosol layersE. Botev, V. Protopopova, I. Popova, B. Babachkova, S. Velichkova, I. Tzoncheva, S. Dimitrova, V. Boychev, D. Lazarov, P. Raykova – Data and analysis of the events recorded by NOTSSI in 2011P. Trifonova, D.Solakov, S. Simeonova, M. Metodiev – Black Sea earthquake safety Net(work) – ESNETP.Trifonova, M. Metodiev – Annual report of the observed geomagnetic activityin Panagyurishte observatoryA. Deleva – Lidar investigations of the troposphere performed during summer 2011 measurement campaignE. Botev, V. Protopopova, I. Popova, B. Babachkova, S. Velichkova, I. Tzoncheva, S. Dimitrova, V. Boychev, D. Lazarov, P. Raykova – Data and analysis of the events recorded by NOTSSI in 2012