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2021, Vol. 44

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Contents
  1. Ivelina Georgieva, Nikolay Miloshev – Fine particles (PM) air pollution – analysis of the results of computer simulations for Bulgaria and Sofia city
  2. Ivelina Georgieva – Annual and seasonal reccurance of the air quality index for the territory of Sofia city
  3. Dimcho Solakov, Plamena Raykova, Stela Simeonova, Irena Aleksandrova – Strong, destructive earthquakes, occurred in Bulgaria after 1900
  4. Plamen Mukhtarov, Rumiana Bojilova, Borislav Andonov – The second G3 (strong) geomagnetic storm in 25th solar cycle on 3-4 november 2021
  5. Maria Chamati – ULF geomagnetic disturbances due to moderate geomagnetic storm at Panagjuriste, Bulgaria
  6. Plamena Raykova, Stela Simeonova, Dimcho Solakov, Irena Aleksandrova – Earthquakes with magnitude Mw>5.0, occurred in Sofia seismogenic zone after 1900
  7. Metodi Metodiev, Petya Trifonova – Annual report of the observed geomagnetic activity at Panagjurishte observatory for 2016
  8. Metodi Metodiev, Petya Trifonova – Annual report of the observed geomagnetic activity at Panagjurishte observatory for 2017
  9. Maria Chamati – Spectral characteristics in ULF range of geomagnetic storm observed at Panagjuriste, Bulgaria on 27-28 september 2017
  10. Maria Popova, Emil Oynakov, Yordan Milkov, Valentin Buchakchiev, Dragomir Dragomirov – Seismicity on the territory of Bulgaria and the adjacent lands recorded by NOTSSI in 2021
National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences
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